Note 5 - Loans Acquired (Details) - Nonaccrual Acquired Loans - Acquired Loans [Member] - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Note 5 - Loans Acquired (Details) - Nonaccrual Acquired Loans [Line Items]
Nonaccrual acquired loans	$ 18,951	$ 2,717
Consumer Portfolio Segment [Member]
Note 5 - Loans Acquired (Details) - Nonaccrual Acquired Loans [Line Items]
Nonaccrual acquired loans	71	29
Consumer Portfolio Segment [Member] | Other Loans [Member]
Note 5 - Loans Acquired (Details) - Nonaccrual Acquired Loans [Line Items]
Nonaccrual acquired loans	71	29
Commercial Real Estate Portfolio Segment [Member]
Note 5 - Loans Acquired (Details) - Nonaccrual Acquired Loans [Line Items]
Nonaccrual acquired loans	15,013	2,394
Commercial Real Estate Portfolio Segment [Member] | Other Loans [Member]
Note 5 - Loans Acquired (Details) - Nonaccrual Acquired Loans [Line Items]
Nonaccrual acquired loans	6,435	271
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Note 5 - Loans Acquired (Details) - Nonaccrual Acquired Loans [Line Items]
Nonaccrual acquired loans	783	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	7,795	2,018
Commercial Portfolio Segment [Member]
Note 5 - Loans Acquired (Details) - Nonaccrual Acquired Loans [Line Items]
Nonaccrual acquired loans	3,867	294
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Note 5 - Loans Acquired (Details) - Nonaccrual Acquired Loans [Line Items]
Nonaccrual acquired loans	3,859	291
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Note 5 - Loans Acquired (Details) - Nonaccrual Acquired Loans [Line Items]
Nonaccrual acquired loans	$ 8	$ 3