Note 5 - Loans Acquired (Details) - Nonaccrual Acquired Loans - Acquired Loans [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Note 5 - Loans Acquired (Details) - Nonaccrual Acquired Loans [Line Items]
Nonaccrual acquired loans	$ 8,883	$ 2,717
Consumer Portfolio Segment [Member]
Note 5 - Loans Acquired (Details) - Nonaccrual Acquired Loans [Line Items]
Nonaccrual acquired loans	83	29
Consumer Portfolio Segment [Member] | Other Loans [Member]
Note 5 - Loans Acquired (Details) - Nonaccrual Acquired Loans [Line Items]
Nonaccrual acquired loans	83	29
Commercial Real Estate Portfolio Segment [Member]
Note 5 - Loans Acquired (Details) - Nonaccrual Acquired Loans [Line Items]
Nonaccrual acquired loans	7,852	2,394
Commercial Real Estate Portfolio Segment [Member] | Other Loans [Member]
Note 5 - Loans Acquired (Details) - Nonaccrual Acquired Loans [Line Items]
Nonaccrual acquired loans	2,905	271
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Note 5 - Loans Acquired (Details) - Nonaccrual Acquired Loans [Line Items]
Nonaccrual acquired loans	151	105
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Note 5 - Loans Acquired (Details) - Nonaccrual Acquired Loans [Line Items]
Nonaccrual acquired loans	4,796	2,018
Commercial Portfolio Segment [Member]
Note 5 - Loans Acquired (Details) - Nonaccrual Acquired Loans [Line Items]
Nonaccrual acquired loans	902	294
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Note 5 - Loans Acquired (Details) - Nonaccrual Acquired Loans [Line Items]
Nonaccrual acquired loans	884	291
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Note 5 - Loans Acquired (Details) - Nonaccrual Acquired Loans [Line Items]
Nonaccrual acquired loans	18	$ 3
Unallocated Financing Receivables [Member]
Note 5 - Loans Acquired (Details) - Nonaccrual Acquired Loans [Line Items]
Nonaccrual acquired loans	$ 46