Consolidated Statements of Changes in Stockholders' Equity - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance at beginning of year (in shares) at Dec. 31, 2013	6,091,707
Balance at beginning of year at Dec. 31, 2013	$ 60,917	$ 21,527,375	$ 9,535,980	$ 31,124,272
Exercise of stock options (in shares)	28,000			28,000
Exercise of stock options	$ 280	101,920		$ 102,200
Stock-based compensation (in shares)	42,320
Stock-based compensation	$ 423	515,510		515,933
Net income (loss)			(2,473,530)	$ (2,473,530)
Balance at end of year (in shares) at Dec. 31, 2014	6,162,027			6,162,027
Balance at end of year at Dec. 31, 2014	$ 61,620	22,144,805	7,062,450	$ 29,268,875
Exercise of stock options (in shares)				0
Stock-based compensation (in shares)	36,108
Stock-based compensation	$ 361	750,397		$ 750,758
Net income (loss)			3,204,996	$ 3,204,996
Balance at end of year (in shares) at Dec. 31, 2015	6,198,135			6,198,135
Balance at end of year at Dec. 31, 2015	$ 61,981	$ 22,895,202	$ 10,267,446	$ 33,224,629