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Note 10 - Income Taxes (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Effective Income Tax Rate Reconciliation, Percent 37.00% 39.20% 37.80%
Deferred Tax Assets, Net of Valuation Allowance $ 32,500,000    
Deferred Tax Liabilities, Gross 17,962,000 $ 22,489,000  
Deferred Tax Assets, Valuation Allowance $ 0 $ 0