Condensed Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Nil Coupon Perpetual Loan Notes [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Treasury Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Nil Coupon Perpetual Loan Notes [Member]	Treasury Stock [Member]	Total
Balance (in shares) at Dec. 31, 2018								24,170
Balance at Dec. 31, 2018								$ 248	$ 138,992	$ (102,495)	$ (1,285)	$ 76	$ (1,484)	$ 34,052
Net income (loss)										(1,289)				(1,289)
Foreign currency translation adjustments											104			104
Stock compensation expense									96					96
Common shares issued upon vesting of restricted stock units (in shares)								18
Common shares issued upon vesting of restricted stock units
Treasury shares withheld (in shares)								(2)
Treasury shares withheld													(2)	(2)
Balance (in shares) at Mar. 31, 2019								24,186
Balance at Mar. 31, 2019			$ 22				$ 22	$ 248	139,088	(103,762)	(1,181)	76	(1,486)	32,983
Balance (in shares) at Dec. 31, 2018								24,170
Balance at Dec. 31, 2018								$ 248	138,992	(102,495)	(1,285)	76	(1,484)	34,052
Net income (loss)														(3,512)
Foreign currency translation adjustments														(276)
Balance (in shares) at Sep. 30, 2019								24,186
Balance at Sep. 30, 2019								$ 248	139,349	(105,985)	(1,561)	76	(1,486)	30,641
Balance (in shares) at Mar. 31, 2019								24,186
Balance at Mar. 31, 2019			$ 22				$ 22	$ 248	139,088	(103,762)	(1,181)	76	(1,486)	32,983
Net income (loss)										(945)				(945)
Foreign currency translation adjustments											(43)			(43)
Stock compensation expense									123					123
Balance (in shares) at Jun. 30, 2019								24,186
Balance at Jun. 30, 2019								$ 248	139,211	(104,707)	(1,224)	76	(1,486)	32,118
Net income (loss)										(1,278)				(1,278)
Foreign currency translation adjustments											(337)			(337)
Stock compensation expense									138					138
Balance (in shares) at Sep. 30, 2019								24,186
Balance at Sep. 30, 2019								$ 248	139,349	(105,985)	(1,561)	76	(1,486)	30,641
Balance (in shares) at Dec. 31, 2019								24,592
Balance at Dec. 31, 2019								$ 254	139,560	(110,325)	(1,778)	76	(1,612)	26,175
Net income (loss)										(2,567)				(2,567)
Foreign currency translation adjustments											(231)			(231)
Stock compensation expense									81					81
Common shares issued upon vesting of restricted stock units (in shares)								55
Common shares issued upon vesting of restricted stock units
Treasury shares withheld (in shares)								(11)
Treasury shares withheld													(5)	(5)
Balance (in shares) at Mar. 31, 2020								24,636
Balance at Mar. 31, 2020								$ 254	139,641	(112,892)	(2,009)	76	(1,617)	23,453
Balance (in shares) at Dec. 31, 2019								24,592
Balance at Dec. 31, 2019								$ 254	139,560	(110,325)	(1,778)	76	(1,612)	26,175
Net income (loss)														(2,735)
Foreign currency translation adjustments														189
Balance (in shares) at Sep. 30, 2020								24,701
Balance at Sep. 30, 2020								$ 255	139,767	(113,060)	(1,589)	76	(1,618)	23,831
Balance (in shares) at Mar. 31, 2020								24,636
Balance at Mar. 31, 2020								$ 254	139,641	(112,892)	(2,009)	76	(1,617)	23,453
Net income (loss)										(2,544)				(2,544)
Foreign currency translation adjustments											152			152
Stock compensation expense									69					69
Common shares issued upon vesting of restricted stock units (in shares)								66
Common shares issued upon vesting of restricted stock units								$ 1					(1)
Treasury shares withheld (in shares)								(1)
Treasury shares withheld
Balance (in shares) at Jun. 30, 2020								24,701
Balance at Jun. 30, 2020								$ 255	139,710	(115,436)	(1,857)	76	(1,618)	21,130
Net income (loss)										2,376				2,376
Foreign currency translation adjustments											268			268
Stock compensation expense									57					57
Balance (in shares) at Sep. 30, 2020								24,701
Balance at Sep. 30, 2020								$ 255	$ 139,767	$ (113,060)	$ (1,589)	$ 76	$ (1,618)	$ 23,831