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Note 5 - Divestitures (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Revenue from Contract with Customer, Including Assessed Tax $ 172,216 $ 155,474 $ 479,797 $ 465,150
Proceeds from Divestiture of Businesses     11,678 0
Gain (Loss) on Disposition of Business (14,624) (0) (14,624) (0)
Goodwill, Impairment Loss     7,600  
Enginetics Corporation [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]        
Proceeds from Divestiture of Businesses 11,700      
Gain (Loss) on Disposition of Business (14,600)      
Engineering Technologies Group [Member]        
Revenue from Contract with Customer, Including Assessed Tax 19,951 $ 26,730 55,091 $ 77,869
Goodwill, Impairment Loss 7,600   7,600  
Impairment of Intangible Assets (Excluding Goodwill), Total $ 5,400      
Engineering Technologies Group [Member] | Enginetics Corporation [Member]        
Revenue from Contract with Customer, Including Assessed Tax     $ 9,000