Consolidated Statements of Stockholders' Deficit - USD ($)	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Treasury Stock	Accumulated Other Comprehensive Loss, Net
Beginning Balance, amount at Dec. 31, 2015	$ (11,708,956)	$ 57,195	$ 167,953,871	$ (120,983,891)	$ (57,032,917)	$ (1,703,214)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(10,998,794)			(10,998,794)
Exercise of stock awards	0	565	(565)
Shares issued for Series A redeemable convertible preferred stock dividend payment	770,790	624	770,166
Share-based compensation to non-employees	1,576,882	1,099	1,575,783
Share-based compensation to employees	751,336		751,336
Accretion of Series A redeemable convertible preferred stock	(1,181,446)		(1,181,446)
Dividends on Series A redeemable convertible preferred stock	(777,890)		(777,890)
Foreign currency translation	(139,394)					(139,394)
Net unrealized gain (loss) on marketable securities	3,406					3,406
Net minimum pension liability	1,489					1,489
Ending Balance, amount at Dec. 31, 2016	(21,702,577)	59,483	169,091,255	(131,982,685)	(57,032,917)	(1,837,713)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,052,401
Restricted stock issued	(25,711)	607	(26,318)
Warrants issued	22,310		22,310
Share-based compensation to non-employees	141,159		141,159
Share-based compensation to employees	281,794		281,794
Accretion of Series A redeemable convertible preferred stock	0
Dividends on Series A redeemable convertible preferred stock	(873,043)		(873,043)
Foreign currency translation	(114,552)					(114,552)
Net unrealized gain (loss) on marketable securities	0
Net minimum pension liability	(6,578)					(6,578)
Ending Balance, amount at Dec. 31, 2017	$ (21,224,797)	$ 60,090	$ 168,637,157	$ (130,930,284)	$ (57,032,917)	$ (1,958,843)