Note 9 - Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Gross UTB balance at beginning of fiscal year	$ 162,000	$ 230,000
Reductions for tax positions of prior years	(12,000)	(68,000)
Gross UTB balance at end of fiscal year	$ 150,000	$ 162,000