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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Jul. 31, 2023
Accounting Policies [Abstract]  
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.

 

   July 31, 2023   April 30, 2023 
   (in thousands) 
Cash and cash equivalents  $3,863   $6,883 
Restricted cash- short term   65    65 
Restricted cash- long term   156    155 
Cash, cash equivalents, restricted cash and restricted cash equivalents  $4,084   $7,103 
Schedule of Investments and Unrealized Gains/Losses

The following table summarizes the Company’s short term investments as of July 31, 2023 and April 30, 2023:

 

   July 31, 2023   April 30, 2023 
Category  Amortized Cost   Unrealized Gains   Market Value   Amortized Cost   Unrealized Gains   Market Value 
   (in thousands)   (in thousands) 
Corporate Bonds  $9,393   $63   $9,456   $14,776   $100   $14,876 
Government Bonds & Notes   10,586   $30    10,616    9,188   $33    9,221 
Government Agency   2,811   $11    2,822    3,826    25    3,851 
Total Short Term Investments  $22,790   $104   $22,894   $27,790   $158   $27,948 
Schedule of Property, Plant and Equipment, Useful Life

 

Description   Estimated depreciable 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 Power Buoys assets   10 years
Leased WAM-V assets   10 years
Schedule of Revenue Recognizes From Operating Lease Arrangements

The below table represents the total revenue recognized under ASC 606 and ASC 842 for the three months ended July 31, 2023 and 2022.

 

   Three months ended July 31, 2023   Three months ended July 31, 2022 
   ASC 606   ASC 842   Total   ASC 606   ASC 842   Total 
   (in thousands)   (in thousands) 
Product Line:                              
WAM-V  $460   $243   $703   $323   $14   $337 
Buoy   250    —    250    12    —    12 
Services   319    —    319    365    —    365 
Total  $1,029   $243   $1,272   $700   $14   $714 
                               
Region:                              
North and South America  $1,029   $243   $1,272   $522   $14   $536 
Asia and Australia   —    —    —    178    —    178 
Total  $1,029   $243   $1,272   $700   $14   $714