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, 2014	$ 24,918,480	$ 2,788,138	$ 25,931,119	$ 1,438,566	$ 44,101,252	$ (2,086,454)	$ 97,091,101
Net earnings					1,863,703		1,863,703
Other comprehensive income				1,291,767			1,291,767
Grant of stock options			85,545				85,545
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)	100,572,450
Balance at Dec. 31, 2015	26,218,200	3,419,280	30,232,582	1,533,828	52,021,764	(2,179,429)	111,246,225
Net earnings					1,793,532		1,793,532
Other comprehensive income				1,117,571			1,117,571
Grant of stock options			84,452				84,452
Exercise of stock options	56,920		4,367				61,287
Sale of treasury stock			136,826			149,639	286,465
Stock Dividends	274	12,768	30,779		(43,821)
Balance at Mar. 31, 2016	$ 26,275,394	$ 3,432,048	$ 30,489,006	$ 2,651,399	$ 53,771,475	$ (2,029,790)	$ 114,589,532