Note 9 - Commitments and Off-balance-sheet Risk (Details) - Exposure to Credit Losses (USD $)	Mar. 31, 2015	Dec. 31, 2014
Note 9 - Commitments and Off-balance-sheet Risk (Details) - Exposure to Credit Losses [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	$ 763,190,000	$ 781,748,000
Commercial Portfolio Segment [Member] | Unused lines of Credit [Member]
Note 9 - Commitments and Off-balance-sheet Risk (Details) - Exposure to Credit Losses [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	518,801,000	554,856,000
1-4 Family Mortgages [Member] | Unused lines of Credit [Member]
Note 9 - Commitments and Off-balance-sheet Risk (Details) - Exposure to Credit Losses [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	62,029,000	60,983,000
Consumer Portfolio Segment [Member] | Unused lines of Credit [Member]
Note 9 - Commitments and Off-balance-sheet Risk (Details) - Exposure to Credit Losses [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	12,085,000	11,649,000
Consumer Other Financing Receivable 1 [Member] | Unused lines of Credit [Member]
Note 9 - Commitments and Off-balance-sheet Risk (Details) - Exposure to Credit Losses [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	7,681,000	8,673,000
Loan Origination Commitments [Member]
Note 9 - Commitments and Off-balance-sheet Risk (Details) - Exposure to Credit Losses [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	131,561,000	110,126,000
Standby Letters of Credit [Member]
Note 9 - Commitments and Off-balance-sheet Risk (Details) - Exposure to Credit Losses [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	$ 31,033,000	$ 35,461,000