Note E - Business Segments - Net Sales by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 25, 2020	Dec. 31, 2021	Dec. 25, 2020
Net Sales	$ 59,889	$ 48,557	$ 107,650	$ 94,737
Intersegment Eliminations [Member]
Net Sales	(17,700)	(16,371)	(32,068)	(31,192)
Manufacturing Segment [Member] | Operating Segments [Member]
Net Sales	49,298	41,705	90,893	80,200
Manufacturing Segment [Member] | Intersegment Eliminations [Member]
Net Sales	(13,200)	(12,170)	(24,143)	(22,908)
Distribution Segment [Member] | Operating Segments [Member]
Net Sales	28,291	23,223	48,825	45,729
Distribution Segment [Member] | Intersegment Eliminations [Member]
Net Sales	(4,500)	(4,201)	(7,925)	(8,284)
Industrial [Member]
Net Sales	7,706	5,286	13,838	10,710
Industrial [Member] | Intersegment Eliminations [Member]
Net Sales	(1,188)	(1,309)	(2,081)	(2,062)
Industrial [Member] | Manufacturing Segment [Member] | Operating Segments [Member]
Net Sales	7,085	5,287	12,992	10,093
Industrial [Member] | Distribution Segment [Member] | Operating Segments [Member]
Net Sales	1,809	1,308	2,927	2,679
Land Based Transmissions [Member]
Net Sales	13,318	11,740	25,560	24,000
Land Based Transmissions [Member] | Intersegment Eliminations [Member]
Net Sales	(5,505)	(4,669)	(9,752)	(8,969)
Land Based Transmissions [Member] | Manufacturing Segment [Member] | Operating Segments [Member]
Net Sales	12,326	10,101	23,710	20,595
Land Based Transmissions [Member] | Distribution Segment [Member] | Operating Segments [Member]
Net Sales	6,497	6,308	11,602	12,374
Marine and Propulsion Systems [Member]
Net Sales	35,520	30,135	62,154	56,310
Marine and Propulsion Systems [Member] | Intersegment Eliminations [Member]
Net Sales	(11,000)	(10,381)	(20,216)	(20,144)
Marine and Propulsion Systems [Member] | Manufacturing Segment [Member] | Operating Segments [Member]
Net Sales	29,861	26,300	54,148	49,479
Marine and Propulsion Systems [Member] | Distribution Segment [Member] | Operating Segments [Member]
Net Sales	16,659	14,216	28,222	26,975
Other [Member]
Net Sales	3,345	1,396	6,098	3,717
Other [Member] | Intersegment Eliminations [Member]
Net Sales	(7)	(12)	(19)	(17)
Other [Member] | Manufacturing Segment [Member] | Operating Segments [Member]
Net Sales	26	17	43	33
Other [Member] | Distribution Segment [Member] | Operating Segments [Member]
Net Sales	$ 3,326	$ 1,391	$ 6,074	$ 3,701