Note 19 - Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Held to maturity securities	$ 25,090	$ 0
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]
Cash and cash equivalents	78,789	52,131
Federal funds sold	0	18
Short term borrowings	19,114	12,075
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	78,789	52,131
Federal funds sold	0	18
Short term borrowings	19,114	12,075
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]
Held to maturity securities	26,977	0
Interest-bearing time deposits in banks	4,571	10,930
Other investment securities	13,759	9,563
Loans held for sale	8,954	7,326
Cash surrender value of life insurance	57,267	52,602
Accrued interest receivable	7,006	6,157
Checking, money market and savings accounts	1,095,178	1,094,442
Other borrowings	152,004	72,380
Accrued interest payable	314	292
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Held to maturity securities	25,090	0
Interest-bearing time deposits in banks	4,572	11,016
Other investment securities	13,759	9,563
Loans held for sale	8,954	7,326
Cash surrender value of life insurance	57,267	52,602
Accrued interest receivable	7,006	6,157
Checking, money market and savings accounts	1,095,178	1,094,442
Other borrowings	151,605	73,335
Accrued interest payable	314	292
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]
Loans receivable—net	1,540,805	1,444,102
Certificates of deposit	548,902	513,241
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Loans receivable—net	1,551,099	1,462,669
Certificates of deposit	$ 548,520	$ 512,430