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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Mar. 31, 2024
USD ($)
Customers
Financial_instituion
Supplier
Customer
Mar. 31, 2023
USD ($)
Customers
Customer
Supplier
Mar. 31, 2022
USD ($)
Customer
Supplier
Apr. 05, 2024
$ / shares
Dec. 21, 2023
$ / shares
Concentration of Credit Risk and Other Risks and Uncertainties          
Equity method investment at cost   $ 0.5      
Impairment of equity method investment $ 0.0        
Share closing bid price | $ / shares         $ 1
Listing Qualification Condition The Notification Letter does not impact the Company’s current listing on The Nasdaq Capital Market at this time, and shares of the Company’s common stock will continue to trade on the Nasdaq Capital Market under the symbol “OESX”. The Notification Letter states that the Company has 180 calendar days, or until October 2, 2024, to regain compliance with the Bid Price Rule. To regain compliance, the Company’s common stock must have a closing bid price of at least $1.00 per share for a minimum of 10 consecutive business days. If the Company does not regain compliance by October 2, 2024, an additional 180 days may be granted to regain compliance, so long as the Company meets The Nasdaq Capital Market initial listing criteria (except for the Bid Price Rule) and notifies Nasdaq in writing of its intention to cure the deficiency during the second compliance period, including the implementation of a reverse stock split, if necessary        
Number of financial institutions | Financial_instituion 1        
Number of supplier more than ten percent of cost of revenue | Supplier 0 0 0    
Number of customer more than ten percent of revenue | Customer 1 1 1    
Subsequent Event [Member]          
Concentration of Credit Risk and Other Risks and Uncertainties          
Share closing bid price | $ / shares       $ 1  
Consecutive Business Days Deficiency To Meet The Minimum Bid Price       30 days  
Minimum [Member]          
Concentration of Credit Risk and Other Risks and Uncertainties          
Inventory consideration usage 9 months        
Maximum [Member]          
Concentration of Credit Risk and Other Risks and Uncertainties          
Inventory consideration usage 12 months        
Cost of revenue | Supplier Concentration Risk | Minimum [Member]          
Concentration of Credit Risk and Other Risks and Uncertainties          
Concentration risk, percentage 10.00% 10.00% 10.00%    
Revenue | Customer Concentration Risk | Customer One          
Concentration of Credit Risk and Other Risks and Uncertainties          
Concentration risk, percentage 25.20% 16.20% 49.10%    
Accounts Receivable | Credit Concentration Risk          
Concentration of Credit Risk and Other Risks and Uncertainties          
Number of customer more than ten percent of accounts receivable | Customers 2 1      
Accounts Receivable | Credit Concentration Risk | Customer One          
Concentration of Credit Risk and Other Risks and Uncertainties          
Concentration risk, percentage 17.30% 10.80%      
Accounts Receivable | Credit Concentration Risk | Customer Two          
Concentration of Credit Risk and Other Risks and Uncertainties          
Concentration risk, percentage 11.70%        
Deferred Bonus          
Concentration of Credit Risk and Other Risks and Uncertainties          
Discretionary bonus payments, accrued expenses $ 0.2 $ 0.0 $ 0.1