Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Cost of Goods and Services Sold	$ 28,767,000	$ 29,404,000
Finite-Lived Intangible Assets, Remaining Amortization Period	2 years 4 months 24 days
Finite-Lived Intangible Assets, Net	$ 223,000		$ 263,000	$ 422,000
Amortization of Intangible Assets	40,000	$ 40,000	$ 159,000
Patents Received [Member]
Finite-Lived Intangible Assets, Net	77,000
Patents In Process [Member]
Finite-Lived Intangible Assets, Net	110,000
Revision of Prior Period, Error Correction, Adjustment [Member]
Accrued Liabilities, Current	178,000
Cost of Goods and Services Sold	$ (178)