Note 7 - Income Taxes - Reconciliation of Income Tax Provision (Benefit) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Computed expected federal income tax	$ 218,000	$ 477,000
State income taxes, net of federal benefit	12,000	100,000
Foreign rate differential	38,000	0
Stock compensation	7,000	0
Non-deductible expenses	6,000	(25,000)
Return to provision true-up	18,000	52,000
Uncertain tax positions	9,000	(17,000)
Alternative minimum tax payable adjustment	0	208,000
Change in valuation allowance	17,000	0
Other deferred tax adjustments	106,000	168,000
Income Tax Expense (Benefit)	$ 431,000	$ 963,000