Note C - Revenue Recognition - Net Sales by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 28, 2018	Dec. 29, 2017
Net Sales	$ 78,107	$ 56,546	$ 152,796	$ 101,611
Operating Segments [Member] | Manufacturing Segment [Member]
Net Sales	70,986	48,580	139,899	88,453
Operating Segments [Member] | Distribution Segment [Member]
Net Sales	27,090	21,336	50,010	38,998
Intersegment Eliminations [Member]
Net Sales	(19,969)		(37,113)
Intersegment Eliminations [Member] | Manufacturing Segment [Member]
Net Sales	(14,931)	(9,489)	(29,681)	(19,821)
Intersegment Eliminations [Member] | Distribution Segment [Member]
Net Sales	(5,038)	$ (3,881)	(7,432)	$ (6,019)
Industrial [Member]
Net Sales	9,116		16,162
Industrial [Member] | Operating Segments [Member] | Manufacturing Segment [Member]
Net Sales	8,253		14,734
Industrial [Member] | Operating Segments [Member] | Distribution Segment [Member]
Net Sales	2,580		3,977
Industrial [Member] | Intersegment Eliminations [Member]
Net Sales	(1,717)		(2,549)
Land Based Transmissions [Member]
Net Sales	29,778		59,414
Land Based Transmissions [Member] | Operating Segments [Member] | Manufacturing Segment [Member]
Net Sales	30,309		59,742
Land Based Transmissions [Member] | Operating Segments [Member] | Distribution Segment [Member]
Net Sales	6,846		12,456
Land Based Transmissions [Member] | Intersegment Eliminations [Member]
Net Sales	(7,377)		(12,784)
Marine and Propulsion Systems [Member]
Net Sales	37,856		74,131
Marine and Propulsion Systems [Member] | Operating Segments [Member] | Manufacturing Segment [Member]
Net Sales	32,412		65,388
Marine and Propulsion Systems [Member] | Operating Segments [Member] | Distribution Segment [Member]
Net Sales	16,307		30,464
Marine and Propulsion Systems [Member] | Intersegment Eliminations [Member]
Net Sales	(10,863)		(21,721)
Other [Member]
Net Sales	1,357		3,089
Other [Member] | Operating Segments [Member] | Manufacturing Segment [Member]
Net Sales	12		35
Other [Member] | Operating Segments [Member] | Distribution Segment [Member]
Net Sales	1,357		3,113
Other [Member] | Intersegment Eliminations [Member]
Net Sales	$ (12)		$ (59)