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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, 2011 | $ 19,277,596 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassAMember | $ 2,027,195 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassCMember | $ 19,487,565 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 654,443 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 22,546,623 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (2,762,835)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 61,230,587 us-gaap_StockholdersEquity
Net earnings |  |  |  |  | 16,712,518 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 16,712,518 us-gaap_NetIncomeLoss
Other comprehensive loss |  |  |  | 1,279,916 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  | 1,279,916 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Grant of stock options |  |  | 251,031 fil_GrantOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 251,031 fil_GrantOfStockOptions
Exercise stock options | 1,371,506 us-gaap_ProceedsFromStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassAMember | 63,782 us-gaap_ProceedsFromStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassCMember | (1,416,982)us-gaap_ProceedsFromStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 18,306 us-gaap_ProceedsFromStockOptionsExercised
Sale of treasury stock |  |  | (62,650)us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 382,401 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 319,751 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued
Stock dividends | 1,037,404 us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassAMember | 104,488 us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassCMember | 3,003,177 us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | (4,145,069)us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Conversion Class C to Class A | 646 fil_ConversionClassCToClassA / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassAMember | (645)fil_ConversionClassCToClassA / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassCMember | (1)fil_ConversionClassCToClassA / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Balance at Dec. 31, 2012 | 21,687,152 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassAMember | 2,194,820 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassCMember | 21,262,140 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,934,359 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 35,114,072 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (2,380,434)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 79,812,109 us-gaap_StockholdersEquity
Net earnings |  |  |  |  | 7,585,921 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 7,585,921 us-gaap_NetIncomeLoss
Other comprehensive loss |  |  |  | (715,963)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  | (715,963)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Grant of stock options |  |  | 88,369 fil_GrantOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 88,369 fil_GrantOfStockOptions
Exercise stock options | 719,572 us-gaap_ProceedsFromStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassAMember | 422,422 us-gaap_ProceedsFromStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassCMember | (345,845)us-gaap_ProceedsFromStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (543,334)us-gaap_ProceedsFromStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 252,815 us-gaap_ProceedsFromStockOptionsExercised
Sale of treasury stock |  |  | 428,794 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 299,143 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 727,937 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued
Stock dividends | 1,124,304 us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassAMember | 126,685 us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassCMember | 1,782,418 us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | (3,033,406)us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 1 us-gaap_StockIssuedDuringPeriodValueStockDividend
Conversion Class C to Class A | 83,546 fil_ConversionClassCToClassA / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassAMember | (83,545)fil_ConversionClassCToClassA / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassCMember | (1)fil_ConversionClassCToClassA / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
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 |  |  |  |  | 7,754,648 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 7,754,648 us-gaap_NetIncomeLoss
Other comprehensive loss |  |  |  | 220,170 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  | 220,170 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Grant of stock options |  |  | 391,220 fil_GrantOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 391,220 fil_GrantOfStockOptions
Reverse stock split true up |  | 30 us-gaap_StockIssuedDuringPeriodSharesReverseStockSplits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassCMember |  |  | (30)us-gaap_StockIssuedDuringPeriodSharesReverseStockSplits / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Exercise stock options | 108,824 us-gaap_ProceedsFromStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassAMember |  | (34,800)us-gaap_ProceedsFromStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 74,024 us-gaap_ProceedsFromStockOptionsExercised
Sale of treasury stock |  |  | 361,679 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 538,171 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 899,850 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued
Stock dividends | 1,190,040 us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassAMember | 132,767 us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassCMember | 1,997,147 us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | (3,319,954)us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Conversion Class C to Class A | 5,042 fil_ConversionClassCToClassA / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassAMember | (5,041)fil_ConversionClassCToClassA / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonClassCMember | (2)fil_ConversionClassCToClassA / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 1 fil_ConversionClassCToClassA / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
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

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