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	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Balance, available for sale securities	$ 576	$ 930
Maturities		(330)
Loss on OTTI Impairment Included in Noninterest Income
Unrealized Gains included in Other Comprehensive Income (Loss)	1	(24)
Balance, available for sale securities	$ 577	$ 576