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Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Accounts Receivable, Allowance for Credit Loss, Current $ 4,534   $ 4,534   $ 2,651
Allowance for Accounts Receivable, Current, Doubtful Accounts 3,370   3,370   1,954
Indefinite-lived Intangible Assets (Excluding Goodwill), Ending Balance $ 4,346   $ 4,346   4,346
Lessor, Operating Lease, Term of Contract 15 years   15 years    
Amortization of Deferred Gain on Sale of Assets $ 40 $ 40 $ 67 $ 81  
Deferred Gain on Sale of Property $ 1,257   $ 1,257   $ 1,324
Revenue Benchmark [Member] | Top Three Customers [Member] | Customer Concentration Risk [Member]          
Number of Major Customers 3 3 3 3  
Concentration Risk, Percentage 34.00% 28.00% 36.00% 28.00%  
Revenue Benchmark [Member] | One of Top Three Customers [Member] | Customer Concentration Risk [Member]          
Concentration Risk, Percentage 14.00% 12.00% 14.00% 14.00%  
Accounts Receivable [Member] | One of Top Three Customers [Member] | Customer Concentration Risk [Member]          
Concentration Risk, Percentage     20.00%   14.00%
Minimum [Member] | Trademarks and Customer Relationships [Member]          
Finite-Lived Intangible Asset, Useful Life     3 years    
Maximum [Member] | Trademarks and Customer Relationships [Member]          
Finite-Lived Intangible Asset, Useful Life     30 years    
Machinery and Equipment [Member] | Minimum [Member]          
Property, Plant and Equipment, Useful Life     7 years    
Machinery and Equipment [Member] | Maximum [Member]          
Property, Plant and Equipment, Useful Life     10 years    
Furniture and Fixtures [Member]          
Property, Plant and Equipment, Useful Life     8 years    
Computer Equipment [Member]          
Property, Plant and Equipment, Useful Life     3 years