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Note 15 - Employee Benefit Plans (Details) - USD ($)
 12 Months Ended
Dec. 31, 1998
Dec. 31, 2015
Dec. 31, 2014
Disclosure Text Block Supplement [Abstract]      
Defined Contribution Plan, Employer Discretionary Contribution Amount   $ 362,000 $ 344,000
Stock Purchased by Employee Stock Ownership Plan, Shares (in Shares) 61,501    
Employee Stock Ownership Plan (ESOP) Loan Payments From ESOP Loan Term 10 years    
Employee Stock Ownership Plan (ESOP), Compensation Expense   $ 0 $ 0
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares (in Shares)   54,204