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Note 8 - Commitments and Off-Balance Sheet Risk (Details) - Exposure to Credit Losses (USD $)
Mar. 31, 2014
Dec. 31, 2013
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 $ 519,882,000 $ 374,543,000
Commercial Unused Line 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 263,387,000 257,937,000
Unused Lines of Credit Secured by 1-4 Family Residential Properties [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 22,994,000 23,429,000
Credit Card 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 8,929,000 9,013,000
Other Consumer 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 4,819,000 5,695,000
Commitments to Make Loans [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 200,374,000 58,799,000
Standby Letter 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 $ 19,379,000 $ 19,670,000