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Note 11 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 34.00%  
Deferred Tax Assets, Federal and State, Net Operating Losses Carryforward $ 3,600 $ 4,100
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration $ 5,200 $ 3,700
Period With Cumulative Gain Position 3 years  
Unrecognized Tax Benefits $ 0  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued $ 0