Note 1 - Operations and Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Revenue	$ 9,768,000	$ 12,338,000	$ 44,917,000	$ 43,629,000
UNITED STATES
Revenue	7,351,000	8,972,000	33,532,000	31,500,000
Non-US [Member]
Revenue	$ 2,417,000	$ 3,366,000	$ 11,385,000	$ 12,129,000