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Note 14 - Employee Benefit Plans (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 1998
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Contribution Plan, Employer Discretionary Contribution Amount   $ 478,000 $ 472,000 $ 362,000
Stock Purchased by Employee Stock Ownership Plan, 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 $ 0
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares   53,181 54,196