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Note 17 - Industry Segment Information - Assets by Industry Segments (Details) - USD ($)
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Goodwill $ 271,221,000 $ 273,843,000 $ 204,091,000
Identifiable Assets 930,878,000 921,889,000  
Identifiable Assets, Discontinued Operations 2,936,000 59,639,000  
Electronics Products Group [Member]      
Goodwill 131,582,000 131,317,000  
Identifiable Assets 324,725,000 332,326,000  
Engraving Group [Member]      
Goodwill 76,742,000 79,392,000  
Identifiable Assets 257,104,000 233,569,000  
Scientific Group [Member]      
Goodwill 15,454 15,454  
Identifiable Assets 90,595 63,657  
Engineering Technologies Group [Member]      
Goodwill 43,685,000 43,890,000  
Identifiable Assets 147,797,000 149,628,000  
Specialty Solutions Group [Member]      
Goodwill 3,305 3,305  
Identifiable Assets 52,528 64,492  
Corporate and Other [Member]      
Goodwill 453,000 485,000  
Identifiable Assets $ 55,193,000 $ 18,578,000