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Note 9 - Senior Secured Line of Credit (Details Textual) - USD ($)
3 Months Ended
Sep. 08, 2023
Jul. 31, 2022
Jun. 30, 2024
Jun. 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]            
Interest Expense, Operating and Nonoperating     $ 200,000 $ 200,000    
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%        
Long-Term Line of Credit     7,000,000      
Interest Expense, Operating and Nonoperating     $ 300,000 $ 200,000    
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%