Note 5 - Loans Acquired (Details) - Nonaccrual Acquired Loans (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Mar. 31, 2015
Consumer:
Nonaccrual acquired loans	$ 2,717
Other Consumer [Member] | Acquired Loans [Member]
Consumer:
Nonaccrual acquired loans		22
Other Consumer [Member]
Consumer:
Nonaccrual acquired loans	29
Consumer Loans [Member] | Acquired Loans [Member]
Consumer:
Nonaccrual acquired loans		22
Consumer Loans [Member]
Consumer:
Nonaccrual acquired loans	29
Construction Loans [Member] | Acquired Loans [Member]
Consumer:
Nonaccrual acquired loans		336
Construction Loans [Member]
Consumer:
Nonaccrual acquired loans	105
Single Family Residential Loans [Member] | Acquired Loans [Member]
Consumer:
Nonaccrual acquired loans		1,452
Single Family Residential Loans [Member]
Consumer:
Nonaccrual acquired loans	2,018
Other Commercial Loans [Member] | Acquired Loans [Member]
Consumer:
Nonaccrual acquired loans		2,046
Other Commercial Loans [Member]
Consumer:
Nonaccrual acquired loans	271
Real Estate Loans [Member] | Acquired Loans [Member]
Consumer:
Nonaccrual acquired loans		3,834
Real Estate Loans [Member]
Consumer:
Nonaccrual acquired loans	2,394
Commercial [Member] | Acquired Loans [Member]
Consumer:
Nonaccrual acquired loans		591
Commercial [Member]
Consumer:
Nonaccrual acquired loans	291
Agricultural Loans [Member] | Acquired Loans [Member]
Consumer:
Nonaccrual acquired loans		126
Agricultural Loans [Member]
Consumer:
Nonaccrual acquired loans	3
Commercial Loans [Member] | Acquired Loans [Member]
Consumer:
Nonaccrual acquired loans		717
Commercial Loans [Member]
Consumer:
Nonaccrual acquired loans	294
Acquired Loans [Member]
Consumer:
Nonaccrual acquired loans		$ 4,573