Note 8 - Commitments and Off-balance Sheet Risk (Details) - Exposure to Credit Losses - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Note 8 - Commitments and Off-balance Sheet Risk (Details) - Exposure to Credit Losses [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	$ 848,089,000	$ 781,748,000
Loan Origination Commitments [Member]
Note 8 - Commitments and Off-balance Sheet Risk (Details) - Exposure to Credit Losses [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	238,884,000	110,126,000
Standby Letters of Credit [Member]
Note 8 - Commitments and Off-balance Sheet Risk (Details) - Exposure to Credit Losses [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	35,562,000	35,461,000
Commercial Portfolio Segment [Member] | Unused lines of Credit [Member]
Note 8 - Commitments and Off-balance Sheet Risk (Details) - Exposure to Credit Losses [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	488,744,000	554,856,000
1-4 Family Mortgages [Member] | Unused lines of Credit [Member]
Note 8 - Commitments and Off-balance Sheet Risk (Details) - Exposure to Credit Losses [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	61,534,000	60,983,000
Consumer Portfolio Segment [Member] | Unused lines of Credit [Member]
Note 8 - Commitments and Off-balance Sheet Risk (Details) - Exposure to Credit Losses [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	14,100,000	11,649,000
Consumer Other Financing Receivable 1 [Member] | Unused lines of Credit [Member]
Note 8 - Commitments and Off-balance Sheet Risk (Details) - Exposure to Credit Losses [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	$ 9,265,000	$ 8,673,000