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	Dec. 31, 2015	Dec. 31, 2014
Note 4 - Loans and Allowance for Loan Losses (Details) - Nonaccrual Loans, Excluding Loans Acquired, Segregated by Class of Loans [Line Items]
Loans in nonaccrual status	$ 17,714	$ 12,038
Consumer Portfolio Segment [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Nonaccrual Loans, Excluding Loans Acquired, Segregated by Class of Loans [Line Items]
Loans in nonaccrual status	654	602
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Nonaccrual Loans, Excluding Loans Acquired, Segregated by Class of Loans [Line Items]
Loans in nonaccrual status	212	197
Consumer Portfolio Segment [Member] | Other Loans [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Nonaccrual Loans, Excluding Loans Acquired, Segregated by Class of Loans [Line Items]
Loans in nonaccrual status	442	405
Commercial Real Estate Portfolio Segment [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Nonaccrual Loans, Excluding Loans Acquired, Segregated by Class of Loans [Line Items]
Loans in nonaccrual status	14,828	10,395
Commercial Real Estate Portfolio Segment [Member] | Other Loans [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Nonaccrual Loans, Excluding Loans Acquired, Segregated by Class of Loans [Line Items]
Loans in nonaccrual status	4,420	1,522
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Nonaccrual Loans, Excluding Loans Acquired, Segregated by Class of Loans [Line Items]
Loans in nonaccrual status	4,955	4,863
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Nonaccrual Loans, Excluding Loans Acquired, Segregated by Class of Loans [Line Items]
Loans in nonaccrual status	5,453	4,010
Commercial Portfolio Segment [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Nonaccrual Loans, Excluding Loans Acquired, Segregated by Class of Loans [Line Items]
Loans in nonaccrual status	2,232	1,041
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Nonaccrual Loans, Excluding Loans Acquired, Segregated by Class of Loans [Line Items]
Loans in nonaccrual status	1,968	585
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Nonaccrual Loans, Excluding Loans Acquired, Segregated by Class of Loans [Line Items]
Loans in nonaccrual status	$ 264	$ 456