Note 11 - Fair Value of Financial Instruments and Fair Value Measurements - Fair Value Measurement Using Significant Unobservable Inputs (Details) - Available-for-sale Securities [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Balance, available for sale securities	$ 930	$ 948
Maturities	(330)
Unrealized Gains included in Other Comprehensive Income (Loss)	(4)	(18)
Balance, available for sale securities	$ 596	$ 930