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Note 2 - Fair Value of Financial Instruments (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Collateral Dependent Loans [Member]          
Impaired Financing Receivable, with Related Allowance, Recorded Investment $ 7,835,000   $ 7,835,000   $ 7,811,000
Impaired Financing Receivable, Related Allowance 2,062,000   2,062,000   1,559,000
Provision for Loan Losses Expensed 1,574,000   1,658,000   741,000
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down     $ 0 $ 1,304,000 1,422,000
Provision Reversal for Loan Losses   $ 19,000   13,000  
Selling Costs, Percentage     10.00%    
Impaired Financing Receivable, Related Allowance 2,630,000   $ 2,630,000   2,164,000
Other Real Estate $ 1,147,000   1,147,000   1,147,000
Other Real Estate, Gross         2,217,000
Real Estate Owned, Valuation Allowance         $ 1,070,000
SEC Schedule III, Real Estate, Write-down or Reserve, Amount     $ 0 $ 0