Note 3 - Loans Receivable (Details Textual) Pure in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Financing Receivable, Unamortized Loan Cost (Fee) and Purchase Premium (Discount)	$ 14,400,000		$ 14,400,000			$ 13,200,000
Financing Receivable, Accrued Interest, after Allowance for Credit Loss	5,800,000		5,800,000			4,700,000
Financing Receivable, Nonaccrual, Interest Income	19,000,000,000	$ 42,000	52,000,000,000	$ 126,000
Financing Receivable, Individually Evaluated for Impairment	$ 4,100,000	$ 1,500,000	$ 4,100,000	$ 1,500,000	$ 2,700,000	$ 3,034,000
Financing Receivable, Modified, Number of Contracts			0