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Note 16 - Related Party Transactions (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Percentage of Related Party Ownership in Other Entities for Grant of Loan 10.00%  
Loans and Leases Receivable, Related Parties $ 139,000 $ 139,000
Related Party Deposit Liabilities 1,300,000 255,000
Due from Affiliates $ 0 $ 25,000