Note 10 - Intangible Assets - Risk Characteristics of Loans Being Serviced (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Original Term Thirty Year Fixed Rate [Member]
Loan Principal Balance	$ 380,018
Weighted Average Interest Rate	3.74%
Weighted Average Remaining Term (Month)	25 years 330 days
Number of Loans	2,593
Original Term Fifteen Year Fixed Rate [Member]
Loan Principal Balance	$ 117,870
Weighted Average Interest Rate	3.03%
Weighted Average Remaining Term (Month)	11 years 240 days
Number of Loans	1,064