Note 13 - Activity of Business Segments - Consolidated Net Sales and Long-lived Asset Information by Geographic Area (Details) - Reportable Geographical Components [Member] - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Consolidated net sales	$ 61,981,000	$ 68,637,000
Consolidated long-lived assets	5,742,000	6,064,000
UNITED STATES
Consolidated net sales	60,489,000	65,844,000
Consolidated long-lived assets	4,380,000	4,623,000
International Member
Consolidated net sales	1,492,000	2,793,000
Consolidated long-lived assets	$ 1,362,000	$ 1,441,000