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Note 2 - Basis of Presentation (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Operating Lease, Right-of-Use Asset $ 3,945  
Operating Lease, Liability, Total 3,953  
Revenues, Total   $ 800
Revenue, Remaining Performance Obligation, Amount 0  
Service and Other Charges On Deposit Accounts, Mortgage Fees from Secondary Market Transactions at the Bank, ATM Fee Income and Other Non-Interest Income [Member]    
Revenues, Total 700  
Accounting Standards Update 2016-02 [Member]    
Operating Lease, Right-of-Use Asset 3,900  
Operating Lease, Liability, Total $ 4,000