Note K - Business Segments and Foreign Operations - Net Sales by Product Group (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Net Sales	$ 340,738	$ 295,127
Operating Segments [Member] | Manufacturing Segment [Member]
Net Sales	295,550	250,934
Operating Segments [Member] | Distribution Segment [Member]
Net Sales	130,956	148,919
Intersegment Eliminations [Member]
Net Sales	(85,768)	(104,726)
Industrial [Member]
Net Sales	41,502	25,668
Industrial [Member] | Operating Segments [Member]
Net Sales	41,502	25,668
Industrial [Member] | Operating Segments [Member] | Manufacturing Segment [Member]
Net Sales	40,717	23,656
Industrial [Member] | Operating Segments [Member] | Distribution Segment [Member]
Net Sales	5,176	5,163
Industrial [Member] | Intersegment Eliminations [Member]
Net Sales	(4,391)	(3,151)
Land Based Transmissions [Member]
Net Sales	80,192	78,518
Land Based Transmissions [Member] | Operating Segments [Member]
Net Sales	80,192	78,518
Land Based Transmissions [Member] | Operating Segments [Member] | Manufacturing Segment [Member]
Net Sales	76,171	71,464
Land Based Transmissions [Member] | Operating Segments [Member] | Distribution Segment [Member]
Net Sales	16,621	40,693
Land Based Transmissions [Member] | Intersegment Eliminations [Member]
Net Sales	(12,600)	(33,639)
Marine and Propulsion Systems [Member]
Net Sales	201,101	171,766
Marine and Propulsion Systems [Member] | Operating Segments [Member]
Net Sales	201,101	171,766
Marine and Propulsion Systems [Member] | Operating Segments [Member] | Manufacturing Segment [Member]
Net Sales	178,553	152,855
Marine and Propulsion Systems [Member] | Operating Segments [Member] | Distribution Segment [Member]
Net Sales	90,196	86,202
Marine and Propulsion Systems [Member] | Intersegment Eliminations [Member]
Net Sales	(67,648)	(67,291)
Other [Member]
Net Sales	17,943	19,175
Other [Member] | Operating Segments [Member]
Net Sales	17,943	19,175
Other [Member] | Operating Segments [Member] | Manufacturing Segment [Member]
Net Sales	109	2,959
Other [Member] | Operating Segments [Member] | Distribution Segment [Member]
Net Sales	18,963	16,861
Other [Member] | Intersegment Eliminations [Member]
Net Sales	$ (1,129)	$ (645)