Note 17 - Industry Segment Information - Net Sales and Income (Loss) by Industry Segments (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2018		Jun. 30, 2017		Jun. 30, 2016
Net sales		$ 227,508	$ 216,743	$ 209,751	$ 214,379	$ 217,089	$ 184,715	$ 173,854	$ 179,600	$ 868,382	[1]	$ 755,258	[1]	$ 751,586	[1]
Depreciation and amortization										29,163		20,315		17,953
Income (Loss) from Operations										84,039		65,026		70,344
Capital Expenditures	[2]									26,647		24,881		19,033
Restructuring charge										(7,594)		(5,825)		(4,232)
Acquisition-related costs										(3,749)		(7,843)
Gain on sale of real estate												652
Other operating income (expense), net (1)	[3]													(7,458)
Interest expense										(8,030)		(4,043)		(2,871)
Other, net										1,243		949		1,052
Income from continuing operations before income taxes										77,252		61,932		68,525
Food Service Equipment Group [Member]
Net sales										396,866		380,970		381,867
Depreciation and amortization										5,960		5,206		5,030
Income (Loss) from Operations										34,853		33,436		40,142
Capital Expenditures	[2]									3,790		5,088		4,560
Restructuring charge										(4,165)		(1,186)		(2,979)
Engraving Group [Member]
Net sales										136,275		105,943		124,120
Depreciation and amortization										5,483		3,100		3,403
Income (Loss) from Operations										28,966		25,584		29,579
Capital Expenditures	[2]									9,401		7,807		4,031
Restructuring charge										(1,688)		(6)		(92)
Engineering Technologies Group [Member]
Net sales										90,781		90,506		82,235
Depreciation and amortization										6,006		5,976		5,363
Income (Loss) from Operations										6,449		9,662		8,258
Capital Expenditures	[2]									3,537		6,510		6,562
Restructuring charge										(1,098)		(3,879)		(160)
Electronics Products Group [Member]
Net sales										196,291		136,689		118,319
Depreciation and amortization										10,564		4,960		3,200
Income (Loss) from Operations										45,310		27,663		21,104
Capital Expenditures	[2]									8,263		4,000		2,796
Restructuring charge										(299)		(499)		(841)
Hydraulics Products Group [Member]
Net sales										48,169		41,150		45,045
Depreciation and amortization										750		730		651
Income (Loss) from Operations										7,316		6,712		7,947
Capital Expenditures	[2]									1,399		1,058		988
Corporate and Other [Member]
Net sales
Depreciation and amortization										400		343		306
Restructuring charge										(344)		(255)		(160)
Corporate Segment [Member]
Income (Loss) from Operations										(27,512)		(25,015)		(24,996)
Capital Expenditures	[2]									$ 257		$ 418		$ 96

[1] Net sales were identified based on geographic location where our products and services were initiated.

[2] Includes capital expenditures in accounts payable of $614 million, $0.5 million, and $2.1 million at June 30, 2018, 2017, and 2016 respectively.

[3] Other operating expense in 2016 consists primarily of a $7.3 million charge to adjust the Roll, Plate, and Machinery business in the Engraving segment to its net realizable value