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Note 10 - Senior Secured Revolving Line of Credit (Details Textual) - USD ($)
12 Months Ended
Sep. 08, 2023
Jul. 31, 2022
Mar. 31, 2024
Mar. 31, 2023
Jul. 31, 2023
Jun. 02, 2021
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] Prime Rate [Member] Prime Rate [Member]        
Promissory Note [Member]            
Debt Instrument, Face Amount           $ 7,000,000
Revolving Credit Facility [Member]            
Line of Credit Facility, Maximum Borrowing Capacity           $ 7,000,000
Debt Instrument, Interest Rate, Stated Percentage   2.50%        
Debt Instrument, Basis Spread on Variable Rate 2.50% 2.50%        
Line of Credit Facility, Interest Rate at Period End   11.00%        
Debt Instrument, Covenant, Deposits Held $ 5,000,000       $ 8,000,000  
Long-Term Line of Credit     $ 7,000,000 $ 7,000,000    
Interest Expense, Operating and Nonoperating     $ 600,000 $ 600,000    
Revolving Credit Facility [Member] | Minimum [Member]            
Line of Credit Facility, Interest Rate at Period End 7.00%