Note 4 - Loans and Allowance for Loan Losses (Details) - Nonaccrual Loans, Excluding Loans Acquired, Segregated by Class of Loans (Loans, excluding acquired loans [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Consumer:
Loans in nonaccrual status	$ 12,038	$ 6,261
Credit Cards [Member]
Consumer:
Loans in nonaccrual status	197	290
Other Consumer [Member]
Consumer:
Loans in nonaccrual status	405	677
Total Consumer Loans [Member]
Consumer:
Loans in nonaccrual status	602	967
Construction Loans [Member]
Consumer:
Loans in nonaccrual status	4,863	116
Single Family Residential Loans [Member]
Consumer:
Loans in nonaccrual status	4,010	2,957
Other Commercial Real Estate Loans [Member]
Consumer:
Loans in nonaccrual status	1,522	1,726
Total Real Estate Loans [Member]
Consumer:
Loans in nonaccrual status	10,395	4,799
Commercial [Member]
Consumer:
Loans in nonaccrual status	585	378
Agricultural Loans [Member]
Consumer:
Loans in nonaccrual status	456	117
Total Commercial Loans [Member]
Consumer:
Loans in nonaccrual status	$ 1,041	$ 495