Note 10 - Intangible Assets - Risk Characteristics of Loans Being Serviced (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Original Term Thirty Year Fixed Rate [Member]
Loan Principal Balance	$ 304,600
Weighted Average Interest Rate	4.19%
Weighted Average Remaining Term (Month)	25 years 180 days
Number of Loans	2,333
Original Term Fifteen Year Fixed Rate [Member]
Loan Principal Balance	$ 91,584
Weighted Average Interest Rate	3.19%
Weighted Average Remaining Term (Month)	10 years 240 days
Number of Loans	951
Adjustable Rate [Member]
Loan Principal Balance	$ 53
Weighted Average Interest Rate	4.38%
Weighted Average Remaining Term (Month)	22 years 60 days
Number of Loans	2