Consolidated Statement of Stockholders' Equity - USD ($)	Preferred Stock	Common Stock	Capital in Excess of Par	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Treasury Stock	Total
Beginning Balance, Amount at Dec. 31, 2013	$ 0	$ 81,860	$ 32,692,568	$ 305,219	$ 4,187,209	$ (1,557,445)	$ 35,709,411
Beginning Balance, Shares at Dec. 31, 2013	0	8,186,031				919,458
Stock-based compensation, Shares
Stock-based compensation, Amount			$ 171,876				171,876
Exercise of stock options, Shares		66,229
Exercise of stock options, Amount		$ 663	$ 5,214				5,877
Shares deducted from exercise of stock options for payment of withholding taxes, Shares		(17,165)
Shares deducted from exercise of stock options for payment of withholding taxes, Amount		$ (172)	$ (133,246)				(133,418)
Excess tax benefit from exercise of stock options			$ 136,971				136,971
Tax benefit from exercise of stock options
Acquisition of treasury stock, Amount						$ (46,728)	(46,728)
Acquisition of treasury stock, Shares						6,880
Dividends					$ (1,312,625)		(1,312,625)
Net income					$ 5,328,419		5,328,419
Change in unrealized gains (losses) on available for sale securities, net of tax				$ 641,113			641,113
Ending Balance, Amount at Dec. 31, 2014	$ 0	$ 82,351	$ 32,873,383	946,332	$ 8,203,003	$ (1,604,173)	40,500,896
Ending Balance, Shares at Dec. 31, 2014	0	8,235,095				926,338
Stock-based compensation, Amount			134,185				134,185
Exercise of stock options, Shares		85,266
Exercise of stock options, Amount		$ 853	(853)
Shares deducted from exercise of stock options for payment of withholding taxes, Shares		(30,755)
Shares deducted from exercise of stock options for payment of withholding taxes, Amount		$ (308)	(243,354)				(243,662)
Excess tax benefit from exercise of stock options			223,721				223,721
Acquisition of treasury stock, Amount						$ (278,022)	(278,022)
Acquisition of treasury stock, Shares						34,631
Dividends					(1,557,398)		(1,557,398)
Net income					6,959,620		6,959,620
Change in unrealized gains (losses) on available for sale securities, net of tax				(462,112)			(462,112)
Ending Balance, Amount at Dec. 31, 2015	$ 0	$ 82,896	$ 32,987,082	$ 484,220	$ 13,605,225	$ (1,882,195)	$ 45,277,228
Ending Balance, Shares at Dec. 31, 2015	0	8,289,606				960,969