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Note 9 - Borrowings (Details Textual) - USD ($)
$ in Thousands
Apr. 01, 2020
Dec. 31, 2020
Dec. 31, 2019
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged   $ 0  
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds   315,600  
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value, Total   1,200 $ 2,000
Debt, Long-term and Short-term, Combined Amount, Total     $ 61
Federal Home Loan Bank Advances [Member]      
Debt, Long-term and Short-term, Combined Amount, Total   0  
Line of Credit [Member] | Unsecured Debt [Member]      
Line of Credit, Current $ 5,000    
Line of Credit [Member] | Unsecured Debt [Member] | Prime Rate [Member]      
Debt Instrument, Basis Spread on Variable Rate 0.75%    
First Mortgage [Member]      
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged   25,400  
Multi Family Mortgage Loans [Member]      
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged   $ 328,100