Note 1 - Basis of Presentation - Revenues and Profit (Loss) Allocations to Reportable Segments (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues	$ 5,034,000	$ 4,476,000	$ 9,881,000	$ 8,840,000
Net Income (Loss) Attributable to Parent, Total	$ 497,000	$ (87,000)	766,000	(58,000)
Domestic Segment [Member]
Revenues			8,281,000	7,415,000
Net Income (Loss) Attributable to Parent, Total			809,000	(35,000)
Foreign Segment [Member]
Revenues			1,600,000	1,425,000
Net Income (Loss) Attributable to Parent, Total			$ (43,000)	$ (23,000)