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Note 9 - Senior Secured Revolving Line of Credit (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Sep. 08, 2023
Jul. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Jul. 31, 2023
Jun. 02, 2021
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%            
Line of Credit Facility, Interest Rate at Period End   11.00%            
Long-Term Line of Credit     $ 7,000,000   $ 7,000,000      
Interest Expense     $ 300,000 $ 200,000 $ 600,000 $ 300,000    
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%              
Revolving Credit Facility [Member] | Prime Rate [Member]                
Debt Instrument, Basis Spread on Variable Rate 2.50% 2.50%