Note 5 - Nonaccrual Acquired Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member]
Loans in nonaccrual status	$ 86	$ 71
Consumer Portfolio Segment [Member] | Acquired Loans [Member]
Loans in nonaccrual status	86	71
Consumer Portfolio Segment [Member] | Other Loans [Member]
Loans in nonaccrual status	1,205	442
Consumer Portfolio Segment [Member]
Loans in nonaccrual status	1,471	654
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Construction Loans [Member]
Loans in nonaccrual status	992	783
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Single Family Residential Loans [Member]
Loans in nonaccrual status	8,340	7,795
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Other Commercial Loans [Member]
Loans in nonaccrual status	3,319	6,435
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member]
Loans in nonaccrual status	12,651	15,013
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans in nonaccrual status	5,312	4,955
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Loans in nonaccrual status	10,353	5,453
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member]
Loans in nonaccrual status	21,522	4,420
Commercial Real Estate Portfolio Segment [Member]
Loans in nonaccrual status	37,187	14,828
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Commercial Loans [Member]
Loans in nonaccrual status	1,453	3,859
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Agricultural Loans [Member]
Loans in nonaccrual status	52	8
Commercial Portfolio Segment [Member] | Acquired Loans [Member]
Loans in nonaccrual status	1,505	3,867
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Loans in nonaccrual status	2,985	1,968
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Loans in nonaccrual status	1,662	264
Commercial Portfolio Segment [Member]
Loans in nonaccrual status	4,647	2,232
Acquired Loans [Member]
Loans in nonaccrual status	14,242	18,951
Loans in nonaccrual status	$ 43,305	$ 17,714