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Statements Of Cash Flows (USD $)
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12 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| OPERATING ACTIVITIES |
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| Cash received from royalties and rents |
$ 19,437,395us-gaap_ProceedsFromRoyaltiesReceived |
$ 18,551,641us-gaap_ProceedsFromRoyaltiesReceived |
$ 27,961,480us-gaap_ProceedsFromRoyaltiesReceived |
| Cash paid to suppliers and employees |
(5,079,787)us-gaap_PaymentsToSuppliersAndEmployees |
(3,951,959)us-gaap_PaymentsToSuppliersAndEmployees |
(3,469,871)us-gaap_PaymentsToSuppliersAndEmployees |
| Interest received |
29,478us-gaap_ProceedsFromInterestReceived |
67,290us-gaap_ProceedsFromInterestReceived |
55,865us-gaap_ProceedsFromInterestReceived |
| NET CASH PROVIDED BY OPERATING ACTIVITIES |
14,387,086us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations |
14,666,972us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations |
24,547,474us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations |
| INVESTING ACTIVITIES |
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| United States Treasury securities purchased |
(6,250,000)us-gaap_PaymentsToAcquireHeldToMaturitySecurities |
(5,275,000)us-gaap_PaymentsToAcquireHeldToMaturitySecurities |
(10,550,000)us-gaap_PaymentsToAcquireHeldToMaturitySecurities |
| United States Treasury securities matured |
7,050,000us-gaap_ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities |
9,600,000us-gaap_ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities |
7,675,000us-gaap_ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities |
| Expenditures for building and equipment |
|
(23,206)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |
(29,990)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |
| NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES |
800,000us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations |
4,301,794us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations |
(2,904,990)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations |
| FINANCING ACTIVITIES |
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| Distributions paid |
(15,000,000)us-gaap_PaymentsOfDividends |
(18,900,000)us-gaap_PaymentsOfDividends |
(21,750,000)us-gaap_PaymentsOfDividends |
| NET CASH USED IN FINANCING ACTIVITIES |
(15,000,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations |
(18,900,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations |
(21,750,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations |
| NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS |
187,086us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease |
68,766us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease |
(107,516)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease |
| CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR |
712,197us-gaap_CashAndCashEquivalentsAtCarryingValue |
643,431us-gaap_CashAndCashEquivalentsAtCarryingValue |
750,947us-gaap_CashAndCashEquivalentsAtCarryingValue |
| CASH AND CASH EQUIVALENTS AT END OF YEAR |
899,283us-gaap_CashAndCashEquivalentsAtCarryingValue |
712,197us-gaap_CashAndCashEquivalentsAtCarryingValue |
643,431us-gaap_CashAndCashEquivalentsAtCarryingValue |
| RECONCILIATION OF NET INCOME TO NET CASH PROVIDED BY OPERATING ACTIVITIES |
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| Net income |
13,123,533us-gaap_NetIncomeLoss |
14,790,714us-gaap_NetIncomeLoss |
20,068,433us-gaap_NetIncomeLoss |
| Adjustments to reconcile net income to net cash provided by operating activities: |
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| Depreciation and amortization |
749,900us-gaap_DepreciationDepletionAndAmortization |
744,071us-gaap_DepreciationDepletionAndAmortization |
732,379us-gaap_DepreciationDepletionAndAmortization |
| Net periodic pension cost (Note 7) |
464,549us-gaap_PensionExpense |
776,646us-gaap_PensionExpense |
690,387us-gaap_PensionExpense |
| Pension contribution (Note 7) |
(1,679,091)us-gaap_PensionContributions |
(1,315,301)us-gaap_PensionContributions |
(799,918)us-gaap_PensionContributions |
| Net decrease (increase) in assets: |
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|
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| Accrued interest |
16,748us-gaap_IncreaseDecreaseInAccruedInterestReceivableNet |
46,338us-gaap_IncreaseDecreaseInAccruedInterestReceivableNet |
19,115us-gaap_IncreaseDecreaseInAccruedInterestReceivableNet |
| Royalties receivable |
1,489,869us-gaap_IncreaseDecreaseInReceivables |
(378,796)us-gaap_IncreaseDecreaseInReceivables |
3,842,178us-gaap_IncreaseDecreaseInReceivables |
| Net increase (decrease) in liabilities: |
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| Accounts payable and accrued expenses |
195,578us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities |
(11,900)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities |
(24,600)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities |
| Deferred compensation |
26,000us-gaap_IncreaseDecreaseInDeferredCompensation |
15,200us-gaap_IncreaseDecreaseInDeferredCompensation |
19,500us-gaap_IncreaseDecreaseInDeferredCompensation |
| NET CASH PROVIDED BY OPERATING ACTIVITIES |
$ 14,387,086us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations |
$ 14,666,972us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations |
$ 24,547,474us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations |