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Note F - Debt (Details Textual)
9 Months Ended
Feb. 13, 2024
USD ($)
Aug. 18, 2021
USD ($)
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2022
USD ($)
Aug. 23, 2021
Jun. 30, 2021
USD ($)
May 24, 2021
USD ($)
Payments to Acquire Property, Plant, and Equipment, Total     $ 2,159,000 $ 1,983,000          
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) [Member] Secured Overnight Financing Rate (SOFR) [Member]              
Line of Credit, Current     2,000,000   $ 3,400,000        
Interest Rate Swap [Member]                  
Derivative, Fixed Interest Rate   2.40%         2.40%    
Manufacturing Facility and Warehouse [Member] | Carlsbad, California [Member]                  
Payments to Acquire Property, Plant, and Equipment, Total   $ 17,500,000              
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member]                  
Line of Credit Facility, Maximum Borrowing Capacity $ 12,500,000 $ 20,000,000             $ 20,000,000
Debt Instrument Covenant Capital Expenditures Limitation, Amount, Next Twelve Years           $ 15,000,000   $ 10,000,000  
Debt Instrument, Basis Spread on Variable Rate 2.25% 1.29%              
Debt Instrument Covenant Minimum, Net Income Required $ 1                
Debt Instrument Covenant, Fixed Charge Coverage Ratio 1.25                
Debt Instrument Covenant Capital Expenditures Limitation, Amount, After Twelve Years $ 6,500,000                
Line of Credit, Availability Reserve Percentage 10.00%                
Long-term Debt, Percentage Bearing Fluctuating Interest, Threshold Amount $ 100,000                
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.25%                
Debt Instrument Basis Spread on Elected Fixed Rate Borrowing 1.00%                
Line of Credit Facility, Current Borrowing Capacity     8,500,000            
Line of Credit, Current     2,000,000            
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member] | Maximum [Member]                  
Ratio of Indebtedness to Net Capital 1.5                
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member] | Term Loan [Member]                  
Debt Instrument, Face Amount   $ 10,000,000              
Debt Instrument, Basis Spread on Variable Rate   1.80%              
Debt Instrument, Term (Year)   7 years              
Long-Term Debt     $ 9,000,000