Note 3 - Loans and Allowance for Loan Losses - Troubled Debt Restructurings That are Not Performing According to Their Restructured Terms (Details) - Nonperforming Financial Instruments [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Number of contracts, not performing	1	1
Recorded investment, not performing	$ 396	$ 391
Multi-family Residential Portfolio Segment [Member]
Number of contracts, not performing	1	1
Recorded investment, not performing	$ 396	$ 391