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Note 13 - Cash Flow Information (Tables)
12 Months Ended
May 01, 2021
Notes Tables  
Cash Flow, Operating Capital [Table Text Block]
  

Year Ended

 
  May 1, 2021  May 2, 2020  April 27, 2019 

(Increase) decrease:

            

Account receivable

 $4,864  $(7,461) $10,856 

Long-term receivables

  1,737   (1,173)  329 

Inventories

  13,900   (8,347)  (4,076)

Contract assets

  3,080   (1,931)  (3,040)

Prepaid expenses and other current assets

  2,450   (1,403)  472 

Income taxes receivables

  (148)  533   4,250 

Investment in affiliates and other assets

  744   (3,137)  48 

Increase (decrease):

            

Accounts payable

  (7,081)  2,377   (2,747)

Contract liabilities

  12,628   4,548   10,774 

Accrued expenses

  (2,936)  6,745   4,631 

Warranty obligations

  696   273   (4,393)

Long-term warranty obligations

  (367)  883   (1,079)

Income taxes payable

  (173)  390   (3,023)

Long-term marketing obligations and other payables

  2,337   (387)  (1,116)
  $31,731  $(8,090) $11,886 
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
  

Year Ended

 
  May 1, 2021  May 2, 2020  April 27, 2019 

Cash payments for:

            

Interest

 $264  $46  $177 

Income taxes, net of refunds

  2,557   977   (1,934)
Schedule of Other Significant Noncash Transactions [Table Text Block]
  

Year Ended

 
  May 1, 2021  May 2, 2020  April 27, 2019 

Demonstration equipment transferred to inventory

 $56  $10  $97 

Purchases of property and equipment included in accounts payable

  667   1,951   1,106 

Contributions of common stock under the ESPP

  565   2,311   1,650