Note 13 - Related Parties (Details Textual) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Related Party Deposits and Repurchase Agreements	$ 15,400,000	$ 19,800,000
Directors and Executive Officers [Member]
Loan Commitments to Related Parties	20,500,000	11,500,000
Loans and Leases Receivable, Related Parties	$ 14,473,000	$ 8,882,000	$ 11,151,000