Note 11 - Income Taxes - Income Tax Reconciliation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income taxes based on US statutory rate of 34%	$ 1,419,000	$ 518,000
Non-deductible meals and entertainment	5,000	7,000
Domestic manufacturer's deduction	(71,000)	(18,000)
Foreign taxes	(169,000)	(11,000)
State taxes	66,000	75,000
Other	(243,000)	(91,000)
	$ 1,007,000	$ 480,000