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, 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			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)
Deemed dividends on Series A redeemable convertible preferred stock	0
Foreign currency translation	(114,552)					(114,552)
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(906,714)
Warrants issued	5,213,928		5,213,928
Warrants cancelled	(623,920)		(623,920)
Warrants exercised	489,321	527,164	(57,070,760)		57,032,917
Share-based compensation to employees	64,672		64,672
Accretion of Series A redeemable convertible preferred stock	(254,212)		(254,212)
Dividends on Series A redeemable convertible preferred stock	(1,035,977)		(1,035,977)
Deemed dividends on Series A redeemable convertible preferred stock	(2,269,042)		(2,269,042)
Foreign currency translation	59,035					59,035
Net minimum pension liability	4,706					4,706
Modified retrospective opening balance adjustment	8,929,204			8,929,204
Ending Balance, amount at Dec. 31, 2018	$ (11,553,796)	$ 587,254	$ 112,661,846	$ (122,907,794)	$ 0	$ (1,895,102)