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

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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