Note 13 - Income Taxes - Income Tax Rate Reconciliation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income taxes at U.S. statutory rate	$ 5,000	$ (379,000)
State income taxes, net of federal benefit	8,000	7,000
Higher effective taxes on earnings in foreign countries	77,000	38,000
Foreign corporate income taxes	51,000	97,000
Foreign income tax audit settlements	154,000
Life insurance settlement		118,000
GILTI	71,000	34,000
Nondeductible meals and entertainment expense	7,000	9,000
Valuation allowance, net	91,000	186,000
Other	4,000	(12,000)
	$ 468,000	$ 98,000