Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands		Common Stock Outstanding [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]		Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2016		20,916,848
Balance at Dec. 31, 2016		$ 21	$ 150,174			$ (95,970)	$ (5,590)	$ 48,635
Issuance of common stock (in shares)		7,392,856
Issuance of common stock		$ 7	18,898					18,905
Common stock issued for exercises of options (in shares)		245
Common stock issued for exercises of options
Common stock issued for compensation, services and royalty payments (in shares)		96,907
Common stock issued for compensation, services and royalty payments			455					455
Net Income (Loss) Attributable to Parent, Total						(12,589)		(12,589)
Other comprehensive income (loss)							2,080	2,080
Balance (in shares) at Dec. 31, 2017		28,406,856
Balance at Dec. 31, 2017		$ 28	169,527			(108,559)	(3,510)	57,486
Common stock issued for compensation, services and royalty payments (in shares)		146,030
Common stock issued for compensation, services and royalty payments		$ 1	371					372
Net Income (Loss) Attributable to Parent, Total						(17,325)		(17,325)
Other comprehensive income (loss)							(886)	(886)
Cumulative effect of accounting change at Dec. 31, 2017	[1]				[2]	1,891		1,891
Balance at Dec. 31, 2017		$ 28	169,527			(106,668)	(3,510)	59,377
Balance (in shares) at Dec. 31, 2018		28,552,886
Balance at Dec. 31, 2018		$ 29	169,898			(123,993)	(4,396)	41,538
Common stock issued for compensation, services and royalty payments (in shares)		183,550
Common stock issued for compensation, services and royalty payments			208					208
Net Income (Loss) Attributable to Parent, Total						(1,129)		(1,129)
Other comprehensive income (loss)							25	25
Cumulative effect of accounting change at Dec. 31, 2018						2,888		2,888
Balance at Dec. 31, 2018		$ 29	169,898			(121,105)	(4,396)	44,426
Common stock purchased as treasury shares (in shares)				(353,063)
Common stock purchased as treasury shares				$ (413)				(413)
Balance (in shares) at Dec. 31, 2019		28,736,436		(353,063)
Balance at Dec. 31, 2019		$ 29	$ 170,106	$ (413)		$ (122,234)	$ (4,371)	$ 43,117

[1] Represents adjustment to accumulated deficit upon the adoption of Accounting Standards Codification Topic 606.

[2] Represents adjustment to accumulated deficit upon the adoption of Accounting Standards Codification Topic 606.