Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)	Total	Common Stock	Additional Paid-In Captal	Accumulated Other Comprehensive Loss	Accumulated Deficit
Balance at Dec. 31, 2020	$ 19,370,000	$ 54,000	$ 24,968,000	$ (150,000)	$ (5,502,000)
Balance (in shares) at Dec. 31, 2020		5,352,626
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	107,000		107,000
Stock-based compensation (in shares)		19,562
Stock options exercised	8,000		8,000
Stock options exercised (in shares)		2,000
Stock for tax withholding	(35,000)		(35,000)
Stock for tax withholding (in shares)		(7,002)
Dividends declared	(644,000)				(644,000)
Transfers of investments from held-to-maturity to available-for-sale classification	(62,000)			(62,000)
Comprehensive income:
Foreign currency translation adjustment	(35,000)			(35,000)
Net income	1,883,000				1,883,000
Balance at Jun. 30, 2021	20,654,000	$ 54,000	25,048,000	(185,000)	(4,263,000)
Balance (in shares) at Jun. 30, 2021		5,367,186
Balance at Mar. 31, 2021	20,477,000	$ 54,000	24,997,000	(203,000)	(4,371,000)
Balance (in shares) at Mar. 31, 2021		5,354,337
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	54,000		54,000
Stock-based compensation (in shares)		12,527
Stock options exercised	8,000		8,000
Stock options exercised (in shares)		2,000
Stock for tax withholding	(11,000)		(11,000)
Stock for tax withholding (in shares)		(1,678)
Dividends declared	(644,000)				(644,000)
Comprehensive income:
Foreign currency translation adjustment	18,000			18,000
Net income	752,000				752,000
Balance at Jun. 30, 2021	20,654,000	$ 54,000	25,048,000	(185,000)	(4,263,000)
Balance (in shares) at Jun. 30, 2021		5,367,186
Balance at Dec. 31, 2021	19,794,000	$ 54,000	25,167,000	(288,000)	(5,139,000)
Balance (in shares) at Dec. 31, 2021		5,378,857
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	268,000		268,000
Stock-based compensation (in shares)		15,300
Stock options exercised	$ 32,000		32,000
Stock options exercised (in shares)	7,000	7,000
Stock for tax withholding	$ (15,000)		(15,000)
Stock for tax withholding (in shares)		(2,270)
Dividends declared	(1,291,000)				(1,291,000)
Transfers of investments from held-to-maturity to available-for-sale classification	62,000
Comprehensive income:
Foreign currency translation adjustment	(193,000)			(193,000)
Net income	92,000				92,000
Balance at Jun. 30, 2022	18,625,000	$ 54,000	25,452,000	(543,000)	(6,338,000)
Balance (in shares) at Jun. 30, 2022		5,398,887
Balance at Mar. 31, 2022	19,333,000	$ 54,000	25,396,000	(350,000)	(5,767,000)
Balance (in shares) at Mar. 31, 2022		5,391,488
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	62,000		62,000
Stock-based compensation (in shares)		8,304
Stock for tax withholding	(6,000)		(6,000)
Stock for tax withholding (in shares)		(905)
Dividends declared	(645,000)				(645,000)
Transfers of investments from held-to-maturity to available-for-sale classification	(62,000)			(62,000)
Comprehensive income:
Foreign currency translation adjustment	(131,000)			(131,000)
Net income	74,000				74,000
Balance at Jun. 30, 2022	$ 18,625,000	$ 54,000	$ 25,452,000	$ (543,000)	$ (6,338,000)
Balance (in shares) at Jun. 30, 2022		5,398,887