Note 2 - Accounting Policies - Revenues Allocations to Reportable Segments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenues	$ 17,628,000	$ 17,837,000
Domestic Segment [Member]
Revenues	14,719,000	16,204,000
Foreign Segment [Member]
Revenues	$ 2,909,000	$ 1,633,000