Note 10 - Intangible Assets - Risk Characteristics of Loans Being Serviced (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Original Term Thirty Year Fixed Rate [Member]
Loan Principal Balance	$ 252,850
Weighted Average Interest Rate	4.08%
Weighted Average Remaining Term (Month)	25 years 150 days
Number of Loans	2,049
Original Term Fifteen Year Fixed Rate [Member]
Loan Principal Balance	$ 104,740
Weighted Average Interest Rate	3.10%
Weighted Average Remaining Term (Month)	11 years 150 days
Number of Loans	1,119
Adjustable Rate [Member]
Loan Principal Balance	$ 56
Weighted Average Interest Rate	3.25%
Weighted Average Remaining Term (Month)	23 years 330 days
Number of Loans	2