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Note 3 - Segment Reporting Information (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2021
Number of Operating Segments 2    
Revenue from Contract with Customer, Including Assessed Tax $ 127,069 $ 106,397  
Intersegment Revenue Markup Percentage 10.00%    
Display Solutions Segment [Member]      
Revenue from Contract with Customer, Including Assessed Tax $ 59,536 $ 55,137  
Revenue Benchmark [Member] | Customer Concentration Risk [Member]      
Number of Major Customers 0    
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Display Solutions Segment [Member] | One Customer [Member]      
Number of Major Customers   1  
Revenue from Contract with Customer, Including Assessed Tax   $ 12,300  
Concentration Risk, Percentage   12.00%  
Accounts Receivable [Member] | Customer Concentration Risk [Member]      
Number of Major Customers     0
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Display Solutions Segment [Member] | One Customer [Member]      
Number of Major Customers 1    
Concentration Risk, Percentage 11.00%    
Accounts Receivable, after Allowance for Credit Loss, Total $ 8,500