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, 2015	$ 26,218,200	$ 3,419,280	$ 30,232,582	$ (499,358)	$ 60,525,404	$ (2,179,429)	$ 117,716,679
Other comprehensive income				299,566			299,566
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
Net earnings					2,537,941		2,537,941
Stock Dividends	274	12,768	30,779		(43,821)
Balance at Mar. 31, 2016	26,275,394	3,432,048	30,489,006	(199,792)	63,019,524	(2,029,790)	120,986,390
Balance at Dec. 31, 2015	26,218,200	3,419,280	30,232,582	(499,358)	60,525,404	(2,179,429)	117,716,679
Balance at Dec. 31, 2016	27,638,012	3,804,458	34,813,246	264,822	67,409,204	(1,370,611)	132,559,131
Other comprehensive income				21,292			21,292
Grant of stock options			101,996				101,996
Sale of treasury stock			178,002			146,065	324,067
Purchase of treasury stock						(185,470)	(185,470)
Net earnings					1,860,000		1,860,000
Stock Dividends	930	4	2,350		(3,284)
Conversion Class C to Class A	1,214	(1,214)
Balance at Mar. 31, 2017	$ 27,640,156	$ 3,803,248	$ 35,095,594	$ 286,114	$ 69,265,920	$ (1,410,016)	$ 134,681,016