Note 4 - Revenue Recognition - Impact of Adoption of Topic 606 (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Dec. 29, 2018	Dec. 30, 2017	Dec. 29, 2018	Dec. 30, 2017
Net sales		$ 372,238	$ 354,894	$ 936,991	$ 923,733
Discontinued operations, net sales			(37,547)		(123,629)
Cost of Product Sold		374,334	326,116	911,291	859,783
Discontinued operations, cost of products sold			(36,280)		(124,297)
Gross profit (loss)			28,778		63,950
Discontinued operations, gross profit (loss)			(1,267)		668
Operating income (loss)		(23,657)	9,458	(28,513)	12,424
Discontinued operations, operating (loss) income			(357)		3,114
Earnings before income taxes		(26,914)	7,641	(37,451)	7,986
Earnings before income taxes			180		4,723
Net (Loss) Earnings From Continuing Operations		(20,040)	8,886	(27,834)	9,696
Net earnings from continuing operations		$ (34,056)	1,157	$ (42,211)	3,909
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Net sales	[1]		387,689		1,015,086
Cost of Product Sold	[1]		357,188		951,639
Gross profit (loss)	[1]		30,501		63,447
Operating income (loss)	[1]		10,271		9,475
Earnings before income taxes	[1]		6,259		(1,166)
Net (Loss) Earnings From Continuing Operations	[1]		4,377		439
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Net sales			4,752		32,276
Cost of Product Sold			5,208		32,441
Gross profit (loss)			(456)		(165)
Operating income (loss)			(456)		(165)
Earnings before income taxes			1,202		4,429
Net (Loss) Earnings From Continuing Operations			$ 3,352		$ 5,348

[1] These reported amounts for the three and nine months ended December 30, 2017 are restated amounts. See the Company's Annual Report on Form 10-K for the year ended March 31, 2018 which was filed on June 29, 2018 and the amended 10-Q filed September 7, 2018 for more information on the restatement.