Note 7 - Loans and Allowance for Loan Losses (Details Textual) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016	Dec. 31, 2016 USD ($)
Allowance for Credit Losses, Change in Method of Calculating Impairment	$ 1,800		$ 2,000
Allowance for Loan Losses, Look-back Period	12		16
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 0		$ 0
Financing Receivable, Modifications, Number of Contracts	0	0