Note 7 - Income Taxes (Details Textual) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Deferred Tax Assets, Valuation Allowance, Total	$ 302,000	$ 235,000
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability	9,000,000
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability, Noncurrent	5,100,000
Domestic Tax Authority [Member]
Deferred Tax Assets, Valuation Allowance, Total	0
Operating Loss Carryforwards	446,000
Operating Loss Carryforwards, Subject to Expiration	$ 2,300,000