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Note 15 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00%   35.00%
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued $ 100 $ 100  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 0 $ 100 $ 100
Domestic Tax Authority [Member]      
Operating Loss Carryforwards 40,000    
Tax Credit Carryforward, Amount 3,300    
State and Local Jurisdiction [Member]      
Operating Loss Carryforwards 46,900    
Tax Credit Carryforward, Amount $ 4,200