Note 2 - Acquisitions - Components of Fair Value of Acquisitions and Allocation of Purchase Price For Acquisition of GS Engineering (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Payments to Acquire Businesses, Net of Cash Acquired, Total		$ 127,924	$ 10,397	$ 153,814
Goodwill, Ending Balance	$ 281,503	281,503	$ 211,751
GS Engineering [Member]
Cash payments	30,500	30,502
Less, cash acquired		(622)
Payments to Acquire Businesses, Net of Cash Acquired, Total		29,880
Other acquired assets	2,197	2,197
Inventories	228	228
Customer Backlog	180	180
Property, plant, and equipment	1,391	1,391
Identifiable intangible assets	8,910	8,910
Goodwill, Ending Balance	17,976	17,976
Liabilities assumed	$ (1,002)	$ (1,002)