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Note 1 - Basis of Presentation (Details Textual)
$ in Thousands
9 Months Ended 12 Months Ended
Jan. 17, 2017
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2017
USD ($)
Number of Reportable Segments   1    
Period for Creating Allowance for Doubtful Accounts   120 days    
Cumulative Effect of New Accounting Principle in Period of Adoption   $ 1,107    
Retained Earnings [Member]        
Cumulative Effect of New Accounting Principle in Period of Adoption   $ 1,107    
Accounting Standards Update 2016-09 [Member] | Retained Earnings [Member]        
Cumulative Effect of New Accounting Principle in Period of Adoption       $ 1,100
Scenario, Forecast [Member] | Accounting Standards Update 2016-02 [Member]        
New Accounting Pronouncement Effect, Right of Use Assets     $ 13,200  
New Accounting Pronouncement Effect, Lease Obligation Liability     $ 13,200  
Green Bay Acquisition and Davenport Acquisition [Member]        
Business Combination, Consideration Transferred $ 269,900