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Statements of Stockholders' Equity (USD $) | Class A Common Stock | Class C Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings | Treasury Stock | Total
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2013 | $ 23,614,574 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassAMember | $ 2,660,382 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassCMember | $ 23,215,875 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 1,218,396 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 39,666,587 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (2,624,625)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 87,751,189 us-gaap_StockholdersEquity
Net earnings |  |  |  |  | 138,848 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 138,848 us-gaap_NetIncomeLoss
Other comprehensive income |  |  |  | 316,135 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  | 316,135 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Grant of stock options |  |  | 64,325 fil_GrantOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 64,325 fil_GrantOfStockOptions
Exercise of stock options | 69,910 fil_ExerciseOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassAMember |  | (19,611)fil_ExerciseOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 50,299 fil_ExerciseOfStockOptions
Sale of treasury stock |  |  | 76,478 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 105,327 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 181,805 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued
Stock Dividends | 3,446 us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassAMember | (1)us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassCMember | 4,910 us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | (8,355)us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Conversion Class C to Class A | 1,424 fil_ConversionClassCToClassA / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassAMember | (1,423)fil_ConversionClassCToClassA / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassCMember | (1)fil_ConversionClassCToClassA / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Balance at Mar. 31, 2014 | 23,689,354 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassAMember | 2,658,958 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassCMember | 23,341,976 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,534,531 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 39,797,080 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (2,519,298)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 88,502,601 us-gaap_StockholdersEquity
Balance at Dec. 31, 2014 | 24,918,480 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassAMember | 2,788,138 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassCMember | 25,931,119 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,438,566 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 44,101,252 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (2,086,454)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 97,091,101 us-gaap_StockholdersEquity
Net earnings |  |  |  |  | 1,863,703 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 1,863,703 us-gaap_NetIncomeLoss
Other comprehensive income |  |  |  | 1,291,767 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  | 1,291,767 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Grant of stock options |  |  | 85,545 fil_GrantOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 85,545 fil_GrantOfStockOptions
Exercise of stock options |  | 228,046 fil_ExerciseOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassCMember | 15,963 fil_ExerciseOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (244,009)fil_ExerciseOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
Sale of treasury stock |  |  | 134,619 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 105,715 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 240,334 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued
Stock Dividends | 480 us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassAMember | 2 us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassCMember | 728 us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | (1,210)us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Conversion Class C to Class A | 1,064 fil_ConversionClassCToClassA / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassAMember | (1,064)fil_ConversionClassCToClassA / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassCMember |  |  |  |  |
Balance at Mar. 31, 2015 | $ 24,920,024 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassAMember | $ 3,015,122 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassCMember | $ 26,167,974 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 2,730,333 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 45,963,745 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (2,224,748)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 100,572,450 us-gaap_StockholdersEquity

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