Condensed Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands		Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2017		28,406,856
Balance at Dec. 31, 2017		$ 28	$ 169,527	$ (108,559)	$ (3,510)	$ 57,486
Cumulative effect of accounting change | Accounting Standards Update 2014-09 [Member]	[1]			1,891		1,891
Balance at Dec. 31, 2017		$ 28	169,527	(106,668)	(3,510)	59,377
Common stock issued for compensation, services, and royalty payments (in shares)		79,042
Common stock issued for compensation, services, and royalty payments			220			220
Net loss				(3,261)		(3,261)
Other comprehensive income					439	439
Balance, March 31, 2019 (in shares) at Mar. 31, 2018		28,485,898
Balance at Mar. 31, 2018		$ 28	169,747	(109,929)	(3,071)	56,775
Balance (in shares) at Dec. 31, 2018		28,552,886
Balance at Dec. 31, 2018		$ 29	169,898	(123,993)	(4,396)	41,538
Cumulative effect of accounting change | Accounting Standards Update 2016-02 [Member]	[2]			2,888		2,888
Balance at Dec. 31, 2018		$ 29	169,898	(121,105)	(4,396)	$ 44,426
Common stock issued for compensation, services, and royalty payments (in shares)		29,067				29,067
Common stock issued for compensation, services, and royalty payments			40			$ 37
Net loss				(3,003)		(3,003)
Other comprehensive income					92	92
Balance, March 31, 2019 (in shares) at Mar. 31, 2019		28,581,953
Balance at Mar. 31, 2019		$ 29	$ 169,938	$ (124,108)	$ (4,304)	$ 41,555

[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 842.