Note 7 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deemed Dividend Paid by Foreign Subsidiary		$ 9,600,000
Cumulative Tax Incentives	$ 473,000	435,000	$ 1,900,000
Income Tax Credits and Adjustments	10,000	45,000	24,000
Social Security Tax Payable, Current	656,000	1,300,000
Deferred Tax Asset, Prior Year Foreign Tax Credit Carryforwards, Write Off		535,000
Unrecognized Tax Benefits, Ending Balance	1,075,000	768,000	$ 592,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	19,000	15,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 918,000	$ 668,000