Note 10 - Intangible Assets - Risk Characteristics of Loans Being Serviced (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($)
Original Term Thirty Year Fixed Rate [Member]
Loan Principal Balance	$ 416,090
Weighted Average Interest Rate	3.46%
Weighted Average Remaining Term (Month)	312 months
Number of Loans	2,650
Original Term Fifteen Year Fixed Rate [Member]
Loan Principal Balance	$ 118,843
Weighted Average Interest Rate	2.88%
Weighted Average Remaining Term (Month)	142 months
Number of Loans	1,068