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Note 12 - Income Taxes (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Reconciliation, Permanent Differences Amount $ 0.8    
Income Tax Reconciliation, Tax Credits and Qualified Production Activities, Amount 0.3    
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount 0.9    
Income Taxes Paid, Net $ 1.0 $ 0.6 $ 4.7
Minimum [Member]      
Tax Credit Carryforward Expiration 7 years    
Maximum [Member]      
Tax Credit Carryforward Expiration 20 years