Note 14 - Commitments and Off-balance-sheet Risk (Details) - Exposure to Credit Losses (USD $)	Dec. 31, 2014	Dec. 31, 2013
Note 14 - Commitments and Off-balance-sheet Risk (Details) - Exposure to Credit Losses [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	$ 781,748,000	$ 374,543,000
Unused lines of Credit [Member] | Commercial Portfolio Segment [Member]
Note 14 - Commitments and Off-balance-sheet Risk (Details) - Exposure to Credit Losses [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	554,856,000	257,937,000
Unused lines of Credit [Member] | Retail 1-4 Family Mortgages [Member]
Note 14 - Commitments and Off-balance-sheet Risk (Details) - Exposure to Credit Losses [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	60,983,000	23,429,000
Unused lines of Credit [Member] | Consumer Credit Card Financing Receivable [Member]
Note 14 - Commitments and Off-balance-sheet Risk (Details) - Exposure to Credit Losses [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	11,649,000	9,013,000
Unused lines of Credit [Member] | Consumer Other Financing Receivable [Member]
Note 14 - Commitments and Off-balance-sheet Risk (Details) - Exposure to Credit Losses [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	8,673,000	5,695,000
Loan Origination Commitments [Member]
Note 14 - Commitments and Off-balance-sheet Risk (Details) - Exposure to Credit Losses [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	110,126,000	58,799,000
Standby Letters of Credit [Member]
Note 14 - Commitments and Off-balance-sheet Risk (Details) - Exposure to Credit Losses [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	$ 35,461,000	$ 19,670,000