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Note 3 - Segment Reporting Information - Identifiable Assets by Segment (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Jun. 30, 2022
Identifiable assets $ 319,501 $ 311,080
Corporate and Eliminations [Member]    
Identifiable assets 7,546 6,347
Lighting Segment [Member] | Operating Segments [Member]    
Identifiable assets 151,856 152,431
Display Solutions Segment [Member] | Operating Segments [Member]    
Identifiable assets $ 160,099 $ 152,302