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Note 7 - Goodwill and Other Intangible Assets (Details Textual)
1 Months Ended 9 Months Ended
Mar. 01, 2017
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
Feb. 21, 2017
USD ($)
Jun. 30, 2016
USD ($)
Number of Reporting Units     3    
Goodwill   $ 58,376,000 $ 58,376,000   $ 10,508,000
Finite-Lived Intangible Assets, Gross   55,335,000 55,335,000   22,052,000
Intangible Assets, Indefinite-lived, Amount of Fair Value in Excess of Carrying Amount $ 15,200,000        
Intangible Assets, Indefinite-lived, Percentage of Fair Value in Excess of Carrying Amount 445.00%        
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) $ 0        
Customer Relationships [Member]          
Finite-Lived Intangible Assets, Gross   35,563,000 $ 35,563,000   9,316,000
Atlas Lighting Products, Inc. [Member]          
Goodwill       $ 47,868,000  
Lighting Segment [Member]          
Number of Reporting Units     1    
Good will Impairment Testing Value Above Carrying Value   $ 60,000,000 $ 60,000,000    
Good will Impairment Testing Percent Value Above Carrying Value   80.00% 80.00%    
Goodwill   $ 48,003,000 $ 48,003,000   135,000
Graphics Segment [Member]          
Number of Reporting Units     1    
Good will Impairment Testing Value Above Carrying Value   $ 4,200,000 $ 4,200,000    
Good will Impairment Testing Percent Value Above Carrying Value   423.00% 423.00%    
Goodwill   $ 1,165,000 $ 1,165,000   1,165,000
Graphics Segment [Member] | Customer Relationships [Member]          
Finite-Lived Intangible Assets, Gross $ 479,000        
Impairment of Intangible Assets, Finite-lived   479,000      
Technology Segment [Member]          
Good will Impairment Testing Value Above Carrying Value   $ 23,200,000 $ 23,200,000    
Good will Impairment Testing Percent Value Above Carrying Value   95.00% 95.00%    
Goodwill   $ 9,208,000 $ 9,208,000   $ 9,208,000