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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Apr. 30, 2023
Accounting Policies [Abstract]  
Schedule of Revenue Recognizes From Operating Lease Arrangements

The below table represents the total revenue recognized under ASC 606 and ASC 842 fiscal years ended April 30, 2023 and 2022:

 

 

   Fiscal year ended April 30, 2023   Fiscal year ended April 30, 2022 
   ASC 606   ASC 842   Total   ASC 606   ASC 842   Total 
   (in thousands)   (in thousands) 
Product Line:                        
WAM-V  $919   $667   $1,586   $401   $—   $401 
Buoy   269     —    269     379    —    379 
Services   877     —    877     979    —    979 
Total  $2,065    $667   $2,732   $1,759    $—   $1,759 
                               
Region:                              
North and South America  $1,812   $667   $2,479   $1,633   $—   $1,633 
Europe   —    —    —    19    —    19 
Asia and Australia   253    —    253    107    —    107 
Total  $2,065   $667   $2,732   $1,759   $—   $1,759 
Schedule of Cash and Cash Equivalents and Restricted Cash

  

   April 30, 2023   April 30, 2022 
   (in thousands) 
Checking and savings accounts  $2,874   $1,815 
Money market account   4,009    6,070 
Cash and cash equivalents  $6,883   $7,885 
Schedule of Cash and Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the Consolidated Balance Sheets that total to the same amounts shown in the Consolidated Statements of Cash Flows.

  

   April 30, 2023   April 30, 2022 
   (in thousands) 
Cash and cash equivalents  $6,883   $7,885 
Restricted cash- short term   65    258 
Restricted cash- long term   155    219 
Cash, cash equivalents, restricted cash and restricted cash equivalents  $7,103   $8,362 
Schedule of Investments and Unrealized Gains/Losses

The following table summarizes the Company’s short term investments as of April 30, 2023 and 2022:

  

  

April 30, 2023

   

April 30, 2022

  
Category 

Amortized

Cost

  

Unrealized

Gains (Losses)

   Market Value   

Amortized

Cost

     Unrealized Gains (Losses)    

Market Value

  
   (in thousands)                     
Corporate Bonds  $14,776   $

100

   $14,876    $ 37,777     $ 995     $ 38,772  
Government Bonds & Notes  $9,188   $

33

   $9,221    $

9,076

    

$

 (1,022 )   $ 8,054  
Government Agency  $3,826   $

25

   $3,851    $ 2,531    

$

 (11 )   $

2,520

  
Total Short Term Investments  $27,790   $

158

   $27,948    $ 49,384    

$

 (38 )   $ 49,346  
Schedule of Property, Plant and Equipment, Useful Life

Description   Estimated useful life
     
Equipment   5-7 years
Computer equipment & software   3 years
Office furniture & fixtures   3-7 years
Leasehold improvements   Shorter of the estimated useful life or lease term
Leased WAM-V assets   10 years