Note 9 - Stock Option Plan (Details) - Stock Option Plan 1999 [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Note 9 - Stock Option Plan (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in Shares)	7,500	2,500	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 54	$ 15
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 0	$ 0	$ 0