Note 1 - Basis of Presentation - Revenues and Profit (Loss) Allocations to Reportable Segments (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenues	$ 5,134,000	$ 4,828,000	$ 15,627,000	$ 14,709,000
Net Income (Loss) Attributable to Parent	118,000	316,000	195,000	1,082,000
Net income (loss)	118,000	316,000	195,000	1,082,000
Domestic Segment [Member]
Revenues	4,146,000	4,101,000	13,187,000	12,382,000
Net Income (Loss) Attributable to Parent	67,000	287,000	296,000	992,000
Net income (loss)	67,000	287,000	296,000	992,000
Foreign Segment [Member]
Revenues	988,000	727,000	2,440,000	2,327,000
Net Income (Loss) Attributable to Parent	51,000	29,000	(101,000)	90,000
Net income (loss)	$ 51,000	$ 29,000	$ (101,000)	$ 90,000