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Note 3 - Loans and Allowance for Loan Losses - Troubled Debt Restructurings That Are Performing According to Their Restructured Terms (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
Number of contracts 1 10 15
Performing Financial Instruments [Member]      
Number of contracts 31 41  
Recorded investment $ 8,365 $ 13,207  
Multi-Family Residential [Member] | Performing Financial Instruments [Member]      
Number of contracts 7 9  
Recorded investment $ 1,916 $ 2,518  
Commercial Real Estate Loans [Member] | Performing Financial Instruments [Member]      
Number of contracts 2  
Recorded investment $ 1,986  
One-To-Four Family - Mixed Used Property [Member] | Performing Financial Instruments [Member]      
Number of contracts 5 5  
Recorded investment $ 1,692 $ 1,753  
One-To-Four Family - Residential [Member] | Performing Financial Instruments [Member]      
Number of contracts 3 3  
Recorded investment $ 552 $ 572  
Taxi Medallion Portfolio Segment [Member] | Performing Financial Instruments [Member]      
Number of contracts 15 20  
Recorded investment $ 3,926 $ 5,916  
Commercial Business and Other [Member] | Performing Financial Instruments [Member]      
Number of contracts 1 2  
Recorded investment $ 279 $ 462