Note 4 - Loans and Allowance for Loan Losses (Details) - Nonaccrual Loans, Excluding Loans Acquired, Segregated by Class of Loans (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Consumer:
Loans in nonaccrual status		$ 2,717
Credit Cards [Member] | Loans, excluding acquired loans [Member]
Consumer:
Loans in nonaccrual status	290	197
Other Consumer [Member] | Loans, excluding acquired loans [Member]
Consumer:
Loans in nonaccrual status	401	405
Other Consumer [Member]
Consumer:
Loans in nonaccrual status		29
Total Consumer Loans [Member] | Loans, excluding acquired loans [Member]
Consumer:
Loans in nonaccrual status	691	602
Construction Loans [Member] | Loans, excluding acquired loans [Member]
Consumer:
Loans in nonaccrual status	5,341	4,863
Construction Loans [Member]
Consumer:
Loans in nonaccrual status		105
Single Family Residential Loans [Member] | Loans, excluding acquired loans [Member]
Consumer:
Loans in nonaccrual status	4,600	4,010
Single Family Residential Loans [Member]
Consumer:
Loans in nonaccrual status		2,018
Other Commercial Real Estate Loans [Member] | Loans, excluding acquired loans [Member]
Consumer:
Loans in nonaccrual status	2,755	1,522
Total Real Estate Loans [Member] | Loans, excluding acquired loans [Member]
Consumer:
Loans in nonaccrual status	12,696	10,395
Commercial [Member] | Loans, excluding acquired loans [Member]
Consumer:
Loans in nonaccrual status	950	585
Commercial [Member]
Consumer:
Loans in nonaccrual status		291
Agricultural Loans [Member] | Loans, excluding acquired loans [Member]
Consumer:
Loans in nonaccrual status	174	456
Agricultural Loans [Member]
Consumer:
Loans in nonaccrual status		3
Total Commercial Loans [Member] | Loans, excluding acquired loans [Member]
Consumer:
Loans in nonaccrual status	1,124	1,041
Loans, excluding acquired loans [Member]
Consumer:
Loans in nonaccrual status	$ 14,511	$ 12,038