Note 5 - Loans Acquired (Details) - Nonaccrual Acquired Loans (Acquired Loans [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Consumer:
Nonaccrual acquired loans	$ 2,717
Other Consumer [Member]
Consumer:
Nonaccrual acquired loans	29
Consumer Loans [Member]
Consumer:
Nonaccrual acquired loans	29
Construction Loans [Member]
Consumer:
Nonaccrual acquired loans	105
Single Family Residential Loans [Member]
Consumer:
Nonaccrual acquired loans	2,018
Other Commercial Loans [Member]
Consumer:
Nonaccrual acquired loans	271
Real Estate Loans [Member]
Consumer:
Nonaccrual acquired loans	2,394
Commercial [Member]
Consumer:
Nonaccrual acquired loans	291
Agricultural Loans [Member]
Consumer:
Nonaccrual acquired loans	3
Commercial Loans [Member]
Consumer:
Nonaccrual acquired loans	$ 294