Note 6 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Deferred Tax Assets, Valuation Allowance	$ (0)	$ 2,563,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	(2,563,000)
Deferred Tax Assets, Net of Valuation Allowance	4,430,000	1,672,000
Deferred Tax Assets, Net	2,401,000	0
Research Tax Credit Carryforward [Member]
Deferred Tax Assets Capitalized Research And Development	1,007	$ 318,000
Domestic Tax Authority [Member]
Deferred Tax Assets, Net of Valuation Allowance	2,641,000
Foreign Tax Authority [Member] | State Administration of Taxation, China [Member]
Deferred Tax Liabilities, Net	240,000
State and Local Jurisdiction [Member] | Minnesota Department of Revenue [Member]
Tax Credit Carryforward, Amount	$ 120,000