Note K - Business Segments and Foreign Operations - Net Sales by Product Group (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Net Sales	$ 295,127	$ 276,960
Operating Segments [Member]
Net Sales	399,853	366,054
Operating Segments [Member] | Manufacturing Segment [Member]
Net Sales	250,933	244,090
Operating Segments [Member] | Distribution Segment [Member]
Net Sales	148,920	121,964
Intersegment Eliminations [Member]
Net Sales	(104,726)	(89,094)
Industrial [Member]
Net Sales	25,668	29,775
Industrial [Member] | Operating Segments [Member]
Net Sales	25,668	29,775
Industrial [Member] | Operating Segments [Member] | Manufacturing Segment [Member]
Net Sales	23,656	28,445
Industrial [Member] | Operating Segments [Member] | Distribution Segment [Member]
Net Sales	5,163	6,162
Industrial [Member] | Intersegment Eliminations [Member]
Net Sales	(3,151)	(4,832)
Land Based Transmissions [Member]
Net Sales	78,518	73,048
Land Based Transmissions [Member] | Operating Segments [Member]
Net Sales	78,518	73,048
Land Based Transmissions [Member] | Operating Segments [Member] | Manufacturing Segment [Member]
Net Sales	71,464	69,411
Land Based Transmissions [Member] | Operating Segments [Member] | Distribution Segment [Member]
Net Sales	40,693	29,787
Land Based Transmissions [Member] | Intersegment Eliminations [Member]
Net Sales	(33,639)	(26,150)
Marine and Propulsion Systems [Member]
Net Sales	171,766	147,825
Marine and Propulsion Systems [Member] | Operating Segments [Member]
Net Sales	171,766	147,825
Marine and Propulsion Systems [Member] | Operating Segments [Member] | Manufacturing Segment [Member]
Net Sales	152,855	136,992
Marine and Propulsion Systems [Member] | Operating Segments [Member] | Distribution Segment [Member]
Net Sales	86,202	67,033
Marine and Propulsion Systems [Member] | Intersegment Eliminations [Member]
Net Sales	(67,291)	(56,200)
Other [Member]
Net Sales	19,175	26,312
Other [Member] | Operating Segments [Member]
Net Sales	19,175	26,312
Other [Member] | Operating Segments [Member] | Manufacturing Segment [Member]
Net Sales	2,958	9,242
Other [Member] | Operating Segments [Member] | Distribution Segment [Member]
Net Sales	16,862	18,982
Other [Member] | Intersegment Eliminations [Member]
Net Sales	$ (645)	$ (1,912)