Note C - Revenue Recognition - Net Sales by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 29, 2019	Mar. 30, 2018	Mar. 29, 2019	Mar. 30, 2018
Net Sales	$ 77,420	$ 65,349	$ 230,216	$ 166,960
Operating Segments [Member] | Manufacturing Segment [Member]
Net Sales	71,374	58,482	211,273	146,935
Operating Segments [Member] | Distribution Segment [Member]
Net Sales	27,547	22,854	77,557	61,852
Intersegment Eliminations [Member]
Net Sales	(21,501)		(58,614)
Intersegment Eliminations [Member] | Manufacturing Segment [Member]
Net Sales	(16,272)	(13,494)	(45,953)	(33,315)
Intersegment Eliminations [Member] | Distribution Segment [Member]
Net Sales	(5,229)	$ (2,493)	(12,661)	$ (8,512)
Industrial [Member]
Net Sales	9,536		25,698
Industrial [Member] | Operating Segments [Member] | Manufacturing Segment [Member]
Net Sales	8,149		22,883
Industrial [Member] | Operating Segments [Member] | Distribution Segment [Member]
Net Sales	2,457		6,434
Industrial [Member] | Intersegment Eliminations [Member]
Net Sales	(1,070)		(3,619)
Land Based Transmissions [Member]
Net Sales	26,904		86,319
Land Based Transmissions [Member] | Operating Segments [Member] | Manufacturing Segment [Member]
Net Sales	27,133		86,876
Land Based Transmissions [Member] | Operating Segments [Member] | Distribution Segment [Member]
Net Sales	8,309		20,765
Land Based Transmissions [Member] | Intersegment Eliminations [Member]
Net Sales	(8,538)		(21,322)
Marine and Propulsion Systems [Member]
Net Sales	39,741		113,872
Marine and Propulsion Systems [Member] | Operating Segments [Member] | Manufacturing Segment [Member]
Net Sales	36,076		101,464
Marine and Propulsion Systems [Member] | Operating Segments [Member] | Distribution Segment [Member]
Net Sales	15,573		46,037
Marine and Propulsion Systems [Member] | Intersegment Eliminations [Member]
Net Sales	(11,908)		(33,629)
Other [Member]
Net Sales	1,239		4,327
Other [Member] | Operating Segments [Member] | Manufacturing Segment [Member]
Net Sales	16		50
Other [Member] | Operating Segments [Member] | Distribution Segment [Member]
Net Sales	1,208		4,321
Other [Member] | Intersegment Eliminations [Member]
Net Sales	$ 15		$ (44)