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Note 7 - Securities (Details Textual)
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
shares
Mar. 31, 2018
USD ($)
Equity Securities, FV-NI $ 950,000 $ 971,000  
Equity Securities, FV-NI, Unrealized Gain (Loss), Total (21,000) 0  
Equity Securities, FV-NI, Gain (Loss), Total $ 2,300,000 $ 0  
Mutual Fund [Member]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total 1 1  
Equity Securities Unrealized Loss Cumulative Amount $ 50,000 $ 29,000  
Equity Securities, FV-NI, Unrealized Gain (Loss), Total (21,000)    
Visa Class B Stock [Member]      
Equity Securities, FV-NI, Gain (Loss), Total 2,321,000    
Number of Restricted Securities Hold | shares   19,789  
Equity Securities, FV-NI, Restricted     $ 0
Federal Home Loan Bank of Pittsburgh [Member] | FHLB Stock [Member]      
Other than Temporary Impairment Losses, Investments, Total 0 $ 0  
Other Assets [Member] | Federal Home Loan Bank of Pittsburgh [Member]      
Federal Home Loan Bank Stock 5,582,000 6,426,000  
Investment Securities [Member]      
Debt Securities, Available-for-sale, Restricted $ 229,418,000 $ 217,925,000