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Note 6 - Goodwill and Other Intangible Assets (Details Textual)
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 01, 2018
USD ($)
Mar. 01, 2017
USD ($)
Mar. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
May 31, 2018
USD ($)
Number of Reporting Units 3 3     3      
Goodwill, Impairment Loss         $ 28,000,000 $ 479,000  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) $ 0 $ 0            
Intangible Assets, Indefinite-lived, Amount of Fair Value in Excess of Carrying Amount $ 20,600,000 $ 15,200,000            
Intangible Assets, Indefinite-lived, Percentage of Fair Value in Excess of Carrying Amount 604.00% 445.00%            
Lighting Segment [Member]                
Number of Reporting Units         2      
Goodwill, Impairment Loss       $ 28,000,000 $ 28,000,000      
Good will Impairment Testing Value Above Carrying Value $ 21,400,000 $ 60,000,000           $ 13,700,000
Good will Impairment Testing Percent Value Above Carrying Value 15.00% 80.00%           11.00%
Graphics Segment [Member]                
Number of Reporting Units         1      
Goodwill, Impairment Loss              
Good will Impairment Testing Value Above Carrying Value $ 3,300,000 $ 4,200,000            
Good will Impairment Testing Percent Value Above Carrying Value 319.00% 424.00%            
Graphics Segment [Member] | Customer Relationships [Member]                
Impairment of Intangible Assets, Finite-lived     $ 479,000          
Second Lighting Segment [Member]                
Good will Impairment Testing Value Above Carrying Value $ 16,100,000 $ 23,200,000            
Good will Impairment Testing Percent Value Above Carrying Value 69.00% 95.00%