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Note 4 - Revenue Recognition - Impact of Adoption of Topic 606 (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Net sales $ 320,660 $ 327,664 $ 564,753 $ 568,839
Discontinued operations, net sales   46,595   86,082
Cost of products sold 309,652 305,993 536,957 533,667
Discontinued operations, cost of products sold   49,319   88,017
Gross profit (loss)   21,671   35,172
Discontinued operations, gross profit (loss)   2,724   1,935
Operating (loss) income (4,833) 3,699 (4,856) 2,966
Discontinued operations, operating (loss) income   3,572   3,471
Loss (earnings) before income taxes (7,709) 2,268 (10,537) 345
Discontinued operations, loss (earnings) before income taxes   4,105   4,543
Net (Loss) Earnings From Continuing Operations (5,634) 1,443 (7,794) 810
Discontinued operations, net loss (earnings) $ (14,750) 2,543 $ (8,155) 2,752
Previously Reported [Member]        
Net sales [1]   338,470   627,397
Cost of products sold [1]   321,059   594,451
Gross profit (loss) [1]   17,411   32,946
Operating (loss) income [1]   (1,409)   (796)
Loss (earnings) before income taxes [1]   (4,842)   (7,425)
Net (Loss) Earnings From Continuing Operations [1]   (2,958)   (3,938)
Restatement Adjustment [Member] | Accounting Standards Update 2014-09 [Member]        
Net sales   35,789   27,524
Cost of products sold   34,253   27,233
Gross profit (loss)   1,536   291
Operating (loss) income   1,536   291
Loss (earnings) before income taxes   3,005   3,227
Net (Loss) Earnings From Continuing Operations   $ 1,858   $ 1,996
[1] These reported amounts for the three and six months ended September 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.