Note 5 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Unrecognized Tax Benefits	$ 683,000	$ 562,000
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	121,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	470,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	$ 91,000	$ 72,000
Open Tax Year	2012