Note 1 - Basis of Presentation (Details Textual)				6 Months Ended
		Jan. 01, 2021 USD ($)		Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)		Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Number of Operating Segments				1
Retained Earnings (Accumulated Deficit), Total		$ 237,585,000	[1]	$ 276,499,000		$ 264,824,000	[2]
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Total				1,320,000
Minimum Principal Balance of Loans for Quarterly Rating Review				500,000
Financing Receivable, Accrued Interest, after Allowance for Credit Loss				7,110,000		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]	29,749,000	$ 28,981,000	27,858,000	[2]	$ 31,857,000	$ 34,563,000	$ 26,182,000
Deferred Tax Assets, Net of Valuation Allowance, Total	[5]	17,493,000
Other Assets, Total				109,085,000		$ 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				$ 956,000,000
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.