Consolidated Statements of Changes in Convertible Preferred Stock and Stockholders' Equity - USD ($)	Convertible preferred stock	Common Stock	Treasury stock	Additional Paid In Capital	Accumulated Other Comprehensive Income (loss)	Accumulated Deficit	Total
Balance at Dec. 31, 2013	$ 22,438	$ 550,375		$ 101,038,685	$ 135,231	$ (81,891,238)	$ 19,855,491
Balance (in shares) at Dec. 31, 2013	2,243,750	55,037,488
Increase (Decrease) in Stockholders' Equity
Treasury Stock, Value			$ (822,603)				(822,603)
Treasury stock (in shares)			503,100
Restricted stock, net		$ (3)		(5,159)			(5,162)
Restricted stock, net (in shares)		(243)
Warrants exercised		$ 797		(797)
Warrants exercised (in shares)		79,677
Options exercised		$ 5,641		928,391			934,032
Options exercised (in shares)		564,077
Stock-based compensation expense				1,316,133			1,316,133
Cumulative translation adjustment					(309,005)		(309,005)
Net income						3,160,385	3,160,385
Balance at Dec. 31, 2014	$ 22,438	$ 556,810	$ (822,603)	103,277,253	(173,774)	(78,730,853)	24,129,271
Balance (in shares) at Dec. 31, 2014	2,243,750	55,680,999	503,100
Increase (Decrease) in Stockholders' Equity
Treasury Stock, Value			$ (7,060,409)				(7,060,409)
Treasury stock (in shares)			3,102,786
Restricted stock, net		$ (2,727)		(30,144)			(32,871)
Restricted stock, net (in shares)		(272,724)
Options exercised		$ 7,831		1,649,760			1,657,591
Options exercised (in shares)		783,114
Stock-based compensation expense				1,844,157			1,844,157
Cumulative translation adjustment					(336,671)		(336,671)
Net income						10,362,448	10,362,448
Balance at Dec. 31, 2015	$ 22,438	$ 561,914	$ (7,883,012)	106,741,026	(510,445)	(68,368,405)	30,563,516
Balance (in shares) at Dec. 31, 2015	2,243,750	56,191,389	3,605,886
Increase (Decrease) in Stockholders' Equity
Stock issued upon conversion of Convertible Preferred Stock Series A	$ (7,084)	$ 21,629		(14,545)
Stock issued (in shares)	(708,352)	2,162,907
Treasury Stock, Value			$ (23,843,474)				(23,843,474)
Treasury stock (in shares)			6,769,468
Restricted stock, net		$ (1,053)		(654,051)			(655,104)
Restricted stock, net (in shares)		(105,195)
Options exercised		$ 14,173		3,406,784			3,420,957
Options exercised (in shares)		1,417,232
Stock-based compensation expense				1,848,107			1,848,107
Cumulative translation adjustment					(143,963)		(143,963)
Net income						25,072,002	25,072,002
Balance at Dec. 31, 2016	$ 15,354	$ 596,663	$ (31,726,486)	$ 111,327,321	$ (654,408)	$ (43,296,403)	$ 36,262,041
Balance (in shares) at Dec. 31, 2016	1,535,398	59,666,333	10,375,354