CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance at beginning at Dec. 31, 2019		$ 381	$ 101,886	$ (100,756)	$ 1,511
Balance at beginning (in shares) at Dec. 31, 2019		38,136,792
Stock-based compensation			52		52
Net income (loss)				(167)	(167)
Balance at ending at Mar. 31, 2020		$ 381	101,938	(100,923)	1,396
Balance at ending (in shares) at Mar. 31, 2020		38,136,792
Balance at beginning at Dec. 31, 2019		$ 381	101,886	(100,756)	$ 1,511
Balance at beginning (in shares) at Dec. 31, 2019		38,136,792
Stock option exercises (in shares)					78,277
Net income (loss)					$ 795
Balance at ending at Sep. 30, 2020		$ 382	102,055	(99,961)	2,476
Balance at ending (in shares) at Sep. 30, 2020		38,215,069
Balance at beginning at Mar. 31, 2020		$ 381	101,938	(100,923)	1,396
Balance at beginning (in shares) at Mar. 31, 2020		38,136,792
Stock-based compensation			47		47
Net income (loss)				532	532
Balance at ending at Jun. 30, 2020		$ 381	101,985	(100,391)	1,975
Balance at ending (in shares) at Jun. 30, 2020		38,136,792
Balance at beginning at Mar. 31, 2020		$ 381	101,938	(100,923)	1,396
Balance at beginning (in shares) at Mar. 31, 2020		38,136,792
Balance at ending at Sep. 30, 2021		$ 487	104,307	(97,053)	7,741
Balance at ending (in shares) at Sep. 30, 2021		48,725,473
Balance at beginning at Jun. 30, 2020		$ 381	101,985	(100,391)	1,975
Balance at beginning (in shares) at Jun. 30, 2020		38,136,792
Stock option exercises		$ 1	22		23
Stock option exercises (in shares)		78,227
Stock-based compensation			48		48
Net income (loss)				430	430
Balance at ending at Sep. 30, 2020		$ 382	102,055	(99,961)	2,476
Balance at ending (in shares) at Sep. 30, 2020		38,215,069
Balance at beginning at Dec. 31, 2020		$ 382	102,117	(99,767)	2,732
Balance at beginning (in shares) at Dec. 31, 2020		38,221,292
Stock-based compensation			42		42
Net income (loss)				1,310	1,310
Balance at ending at Mar. 31, 2021		$ 382	102,159	(98,457)	4,084
Balance at ending (in shares) at Mar. 31, 2021		38,221,292
Balance at beginning at Dec. 31, 2020		$ 382	102,117	(99,767)	$ 2,732
Balance at beginning (in shares) at Dec. 31, 2020		38,221,292
Stock option exercises (in shares)					367,000
Net income (loss)					$ 2,714
Balance at ending at Sep. 30, 2021		$ 487	104,307	(97,053)	7,741
Balance at ending (in shares) at Sep. 30, 2021		48,725,473
Balance at beginning at Mar. 31, 2021		$ 382	102,159	(98,457)	4,084
Balance at beginning (in shares) at Mar. 31, 2021		38,221,292
Stock option exercises		$ 2	76		78
Stock option exercises (in shares)		143,500
Exercise of conversion rights – convertible loan, related party		$ 101	1,918		2,019
Exercise of conversion rights convertible loan, related party (in shares)		10,095,555
Stock-based compensation			53		53
Net income (loss)				41	41
Balance at ending at Jun. 30, 2021		$ 485	104,206	(98,416)	6,275
Balance at ending (in shares) at Jun. 30, 2021		48,460,347
Issuances of shares and stock option exercises		$ 2	72		74
Issuances of shares and stock option exercises (in shares)		265,126
Stock-based compensation			29		29
Net income (loss)				1,363	1,363
Balance at ending at Sep. 30, 2021		$ 487	$ 104,307	$ (97,053)	$ 7,741
Balance at ending (in shares) at Sep. 30, 2021		48,725,473