Note 6 - Loans Receivable and Allowance for Loan Losses - Non-accrual Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Non-accrual loans	$ 18,529	$ 18,594
Commercial Real Estate Portfolio Segment [Member]
Non-accrual loans	12,733	13,089
Construction and Land Development Portfolio Segment [Member]
Non-accrual loans
Commercial Portfolio Segment [Member]
Non-accrual loans	3,299	3,151
Owner Occupied Real Estate [Member]
Non-accrual loans	1,690	1,546
Consumer Portfolio Segment [Member]
Non-accrual loans	807	808
Residential Portfolio Segment [Member]
Non-accrual loans