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Note 18 - Divestitures (Details Textual) - USD ($) $ in Thousands			3 Months Ended	9 Months Ended	12 Months Ended
	Feb. 28, 2023	Mar. 31, 2021	Mar. 31, 2021	Mar. 31, 2023	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Revenue from Contract with Customer, Including Assessed Tax					$ 741,048	$ 735,339	$ 656,232
Proceeds from Divestiture of Businesses					67,023	0	11,678
Gain (Loss) on Disposition of Business					62,105	(0)	(14,624)
Goodwill, Other Increase (Decrease)					(246)
Goodwill, Impairment Loss					(0)
Procon Pumps Business [Member] \| Discontinued Operations, Disposed of by Sale [Member]
Proceeds from Divestiture of Businesses				$ 67,000
Gain (Loss) on Disposition of Business					62,100
Specialty Solutions Group [Member]
Revenue from Contract with Customer, Including Assessed Tax					127,106	122,827	100,864
Goodwill, Other Increase (Decrease)					(246)
Goodwill, Impairment Loss					(0)
Specialty Solutions Group [Member] \| Procon Pumps Business [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 21,200
Engineering Technologies Group [Member]
Revenue from Contract with Customer, Including Assessed Tax		$ 9,000			81,079	$ 78,117	$ 75,562
Proceeds from Divestiture of Businesses		11,700
Gain (Loss) on Disposition of Business		(14,600)
Goodwill, Other Increase (Decrease)					0
Goodwill, Impairment Loss		7,600	$ 7,600		$ (0)
Impairment of Intangible Assets (Excluding Goodwill)		$ 5,400