Note 10 - Intangible Assets - Risk Characteristics of Loans Being Serviced (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Original Term Thirty Year Fixed Rate [Member]
Loan Principal Balance	$ 292,980
Weighted Average Interest Rate	4.13%
Weighted Average Remaining Term (Month)	25 years 210 days
Number of Loans	2,252
Original Term Fifteen Year Fixed Rate [Member]
Loan Principal Balance	$ 98,179
Weighted Average Interest Rate	3.16%
Weighted Average Remaining Term (Month)	11 years
Number of Loans	991
Adjustable Rate [Member]
Loan Principal Balance	$ 54
Weighted Average Interest Rate	4.38%
Weighted Average Remaining Term (Month)	22 years 240 days
Number of Loans	2