Note Q - Earnings Per Share - Components of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Basic:
Net income (loss)	$ 9,647	$ (6,115)	$ (13,013)
Less: Net earnings attributable to noncontrolling interest	(119)	(179)	(91)
Less: Undistributed earnings attributable to unvested shares	(222)
Net income (loss) available to Twin Disc shareholders	$ 9,306	$ (6,294)	$ (13,104)
Weighted average shares outstanding - basic (in shares)	11,295	11,239	11,203
Basic Income (Loss) Per Share:
Net income (loss) per share - basic (in dollars per share)	$ 0.82	$ (0.56)	$ (1.17)
Diluted:
Net income (loss)	$ 9,647	$ (6,115)	$ (13,013)
Less: Net earnings attributable to noncontrolling interest	(119)	(179)	(91)
Less: Undistributed earnings attributable to unvested shares	(222)
Net income (loss) available to Twin Disc shareholders	$ 9,306	$ (6,294)	$ (13,104)
Weighted average shares outstanding - basic (in shares)	11,295	11,239	11,203
Effect of dilutive stock awards (in shares)	100
Weighted average shares outstanding - diluted (in shares)	11,395	11,239	11,203
Diluted Income (Loss) Per Share:
Net income (loss) per share - diluted (in dollars per share)	$ 0.82	$ (0.56)	$ (1.17)