Note 5 - Intangible Assets and Goodwill - Schedule of Intangible Assets and Goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Intangible assets, net	$ 1,286,000	$ 1,318,000
Goodwill	781,000	781,000
Amortization	(31,000)	$ (32,000)
Impairment charge, intangible assets	(1,255,000)
Impairment charge, goodwill	$ (781,000)