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Note 9 - Senior Secured Line of Credit (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Sep. 08, 2023
Jul. 31, 2022
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 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     10.50%   10.50%      
Long-Term Line of Credit     $ 7,000,000   $ 7,000,000      
Interest Expense, Operating and Nonoperating     $ 300,000 $ 300,000 $ 500,000 $ 600,000    
Debt Instrument, Covenant, Deposits Held $ 5,000,000           $ 8,000,000  
Revolving Credit Facility [Member] | Minimum [Member]                
Line of Credit Facility, Interest Rate at Period End 7.00%