Quarterly report pursuant to Section 13 or 15(d)

Note 3 - Goodwill, Customer Relationships and Other Intangible Assets - Other Intangible Assets (Details)

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Note 3 - Goodwill, Customer Relationships and Other Intangible Assets - Other Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Sep. 30, 2018
Oct. 01, 2017
Apr. 01, 2018
Finite-lived intangible assets, gross amount $ 14,200   $ 14,200   $ 14,200
Finite-lived intangible assets, accumulated amortization 7,342   7,342   6,928
Amortization expense 214 $ 240 414 $ 429  
Amortization of intangibles 214 240 414 429  
Cost of Sales [Member]          
Amortization expense 1 1 3 3  
Amortization of intangibles 1 1 3 3  
Selling, General and Administrative Expenses [Member]          
Amortization expense 213 239 411 426  
Amortization of intangibles 213 239 411 426  
Trademarks and Trade Names [Member]          
Finite-lived intangible assets, gross amount 3,667   3,667   3,667
Finite-lived intangible assets, accumulated amortization 1,379   1,379   1,270
Amortization expense 61 54 109 88  
Amortization of intangibles 61 54 109 88  
Developed Technology [Member]          
Finite-lived intangible assets, gross amount 1,100   1,100   1,100
Finite-lived intangible assets, accumulated amortization 128   128   73
Amortization expense 28 18 55 18  
Amortization of intangibles 28 18 55 18  
Noncompete Agreements [Member]          
Finite-lived intangible assets, gross amount 458   458   458
Finite-lived intangible assets, accumulated amortization 161   161   122
Amortization expense 19 13 39 15  
Amortization of intangibles 19 13 39 15  
Patents [Member]          
Finite-lived intangible assets, gross amount 1,601   1,601   1,601
Finite-lived intangible assets, accumulated amortization 727   727   673
Amortization expense 27 27 54 54  
Amortization of intangibles 27 27 54 54  
Customer Relationships [Member]          
Finite-lived intangible assets, gross amount 7,374   7,374   7,374
Finite-lived intangible assets, accumulated amortization 4,947   4,947   $ 4,790
Amortization expense 79 128 157 254  
Amortization of intangibles $ 79 $ 128 $ 157 $ 254