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Note 15 - Industry Segment Information - Net Sales and Income (Loss) by Industry Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Net sales $ 209,751 $ 173,854 $ 424,130 $ 353,454
Income from operations 18,178 13,234 38,324 33,004
Restructuring costs (1,966) (1,664) (4,970) (2,058)
Acquisition-related costs (703) (1,503) (1,708) (1,503)
Interest expense (1,793) (850) (3,514) (1,547)
Other non-operating income 453 332 1,057 766
Income from continuing operations before income taxes 16,838 12,716 35,867 32,223
Acquisition-related costs (703) (1,503) (1,708) (1,503)
Food Service Equipment Group [Member]        
Net sales 97,222 92,200 200,287 184,852
Income from operations 7,841 7,206 18,266 16,694
Restructuring costs (1,322) (1,120) (2,309) (1,207)
Engraving Group [Member]        
Net sales 33,879 25,861 66,708 52,591
Income from operations 6,796 6,510 14,216 13,907
Restructuring costs (273) (1,082) (6)
Engineering Technologies Group [Member]        
Net sales 21,928 18,549 42,195 37,269
Income from operations 1,529 1,877 2,695 3,372
Restructuring costs (269) (249) (1,034) (433)
Electronics Products Group [Member]        
Net sales 46,035 28,497 92,850 59,148
Income from operations 10,221 6,091 20,457 12,565
Restructuring costs (57) (272) (216) (381)
Hydraulics Products Group [Member]        
Net sales 10,687 8,747 22,090 19,594
Income from operations 1,496 979 3,348 3,108
Corporate and Other [Member]        
Income from operations (7,036) (6,262) (13,980) (13,081)
Restructuring costs $ (45) $ (23) $ (329) $ (31)