Note 4 - Property and Equipment - Property and Equipment (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Buildings	$ 493,000	$ 493,000
Machinery and equipment	16,732,000	15,461,000
Office furniture and equipment	2,927,000	2,541,000
Leasehold improvements	690,000	658,000
Software	0	3,000
Property, Plant and Equipment, Gross	20,842,000	19,156,000
Less accumulated depreciation and amortization	(12,322,000)	(13,569,000)
Total net property and equipment	$ 8,520,000	$ 5,587,000