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Note 2 - Basis of Presentation (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Operating Lease, Right-of-Use Asset $ 3,776   $ 3,776  
Revenue, Remaining Performance Obligation, Amount 0   0  
Operating Lease, Liability, Total 3,792   3,792  
Contract with Customer, Liability, Total 0   0  
Grant [Member]        
Revenues, Total 800   1,600  
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]        
Revenue from Contract with Customer, Including Assessed Tax   $ 800   $ 1,600
Accounting Standards Update 2016-02 [Member]        
Operating Lease, Right-of-Use Asset 3,800   3,800  
Operating Lease, Liability, Total $ 3,800   $ 3,800