Note 10 - Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 01, 2023	Oct. 02, 2022	Oct. 01, 2023	Oct. 02, 2022	Apr. 02, 2023
Finite-lived intangible assets, gross amount	$ 12,940		$ 12,940		$ 12,940
Finite-lived intangible assets, accumulated amortization	9,766		9,766		9,467
Amortization expense	153	$ 121	299	$ 241
Trademarks and Trade Names [Member]
Finite-lived intangible assets, gross amount	2,867		2,867		2,867
Finite-lived intangible assets, accumulated amortization	2,103		2,103		2,025
Amortization expense	43	35	78	70
Noncompete Agreements [Member]
Finite-lived intangible assets, gross amount	98		98		98
Finite-lived intangible assets, accumulated amortization	98		98		98
Amortization expense	0	0	0	0
Patents [Member]
Finite-lived intangible assets, gross amount	1,601		1,601		1,601
Finite-lived intangible assets, accumulated amortization	1,081		1,081		1,055
Amortization expense	13	13	26	26
Customer Relationships [Member]
Finite-lived intangible assets, gross amount	8,174		8,174		8,174
Finite-lived intangible assets, accumulated amortization	6,474		6,474		6,289
Amortization expense	92	73	185	145
Licensing Agreements [Member]
Finite-lived intangible assets, gross amount	200		200		200
Finite-lived intangible assets, accumulated amortization	10		10		$ 0
Amortization expense	$ 5	$ 0	$ 10	$ 0