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Note 2 - Summary of Significant Accounting Policies (Details Textual)
3 Months Ended 6 Months Ended 15 Months Ended
Sep. 30, 2025
USD ($)
shares
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2025
USD ($)
shares
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2025
USD ($)
shares
Mar. 31, 2025
USD ($)
Number of Operating Segments     3   3  
Number of Reportable Segments     3      
Revenue from Contract with Customer, Excluding Assessed Tax $ 18,762,000 $ 32,594,000 $ 37,969,000 $ 65,672,000    
Customer Refund Liability, Current $ 100,000 $ 100,000 $ 100,000 $ 100,000 $ 100,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) | shares 209,916 225,167 209,916 225,167 209,916  
Restricted Cash, Current $ 30,000   $ 30,000   $ 30,000 $ 30,000
Customer Concentration Risk [Member] | Accounts Receivable [Member]            
Number of Major Customers     0 1    
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]            
Concentration Risk, Percentage       45.00%    
Common Stock Warrants [Member]            
Class of Warrant or Right, Outstanding (in shares) | shares 687,903 494,940 687,903 494,940 687,903  
Restricted Stock Units (RSUs) [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number (in shares) | shares 237,649 172,623 237,649 172,623 237,649  
Barter Transactions [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax $ 7,000,000 $ 6,000,000 $ 14,000,000 $ 12,000,000