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Note 5 - Goodwill and Intangible Assets (Details Textual) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Finite-Lived Intangible Assets, Amortization Expense, Year Three $ 100,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 100,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 100,000    
Goodwill 85,488,000   $ 85,488,000
Goodwill, Impairment Loss 0   $ 0
Amortization of Intangible Assets 30,000 $ 30,000  
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 100,000    
Finite-Lived Intangible Assets, Amortization Expense, after Year Four $ 30,000