Note 10 - Intangible Assets - Risk Characteristics of Loans Being Serviced (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Original Term Thirty Year Fixed Rate [Member]
Loan Principal Balance	$ 335,718
Weighted Average Interest Rate	4.06%
Weighted Average Remaining Term (Month)	25 years 240 days
Number of Loans	2,457
Original Term Fifteen Year Fixed Rate [Member]
Loan Principal Balance	$ 96,149
Weighted Average Interest Rate	3.20%
Weighted Average Remaining Term (Month)	11 years
Number of Loans	955
Adjustable Rate [Member]
Loan Principal Balance	$ 40
Weighted Average Interest Rate	4.63%
Weighted Average Remaining Term (Month)	21 years 60 days
Number of Loans	2