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Note 1 - Basis of Presentation (Details Textual)
 3 Months Ended
Jan. 01, 2021
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Number of Operating Segments   1      
Retained Earnings (Accumulated Deficit), Total $ 237,585,000 [1] $ 269,798,000 $ 264,824,000 [2]    
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Total   776,000      
Minimum Principal Balance of Loans for Quarterly Rating Review   500,000      
Financing Receivable, Accrued Interest, after Allowance for Credit Loss   7,320,000 7,540,000    
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance [3] 66,000        
Financing Receivable, Allowance for Credit Loss, Ending Balance 26,182,000 [4] 28,981,000 27,858,000 [2] $ 34,563,000 $ 26,182,000
Deferred Tax Assets, Net of Valuation Allowance, Total [5] 17,493,000        
Other Assets, Total   108,112,000 $ 106,691,000 [2]    
Financial Asset Acquired with Credit Deterioration [Member]          
Financing Receivable, Allowance for Credit Loss, Ending Balance $ 5,880,000        
Other Liabilities [Member]          
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance   $ 775,000      
Cumulative Effect, Period of Adoption, Adjustment [Member]          
Effective Income Tax Rate Reconciliation, Percent, Total 23.37%        
Accounting Standards Update 2016-13 [Member]          
Other Assets, Total $ 57,000        
Accounting Standards Update 2016-13 [Member] | Financial Asset Acquired with Credit Deterioration [Member]          
Financing Receivable, Allowance for Credit Loss, Ending Balance 57,000        
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Retained Earnings (Accumulated Deficit), Total [1] (5,871,000)        
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance [3] 509,000        
Financing Receivable, Allowance for Credit Loss, Ending Balance 13,107,000 [4]       $ 13,107,000
Deferred Tax Assets, Net of Valuation Allowance, Total [5] $ 1,813,000        
[1] Net adjustment to retained earnings related to the adoption of ASU 2016-13.
[2] Derived from audited financial statements
[3] Adjustment to the reserve for unfunded commitments related to the adoption of ASU 2016-13.
[4] Calculated adjustment to the ACL related to the adoption of ASU 2016-13. Includes additional reserve related to purchased deteriorated loans of $5.88 million.
[5] Effect of deferred tax assets related to the adjustment to the ACL form the adoption of ASU 2016-13 using a 23.37% tax rate.