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v3.21.2

Note F - Debt (Details Textual) |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 20, 2021 USD ($) | Aug. 18, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | May 24, 2021 USD ($)
Payments to Acquire Property, Plant, and Equipment, Total |  |  | $ 18,344,000 | $ 1,479,000 |  |
Interest Rate Swap [Member] |  |  |  |  |  |
Derivative, Fixed Interest Rate |  | 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 |  |  |  |  |  | $ 20,000,000.0
Debt Instrument Covenant Capital Expenditures Limitation, Amount, Next Twelve Years |  | $ 15,000,000.0 |  |  | $ 10,000,000.0 |
Debt Instrument Covenant Minimum, Net Income Required |  | $ 1.00 |  |  |  |
Debt Instrument Covenant, Fixed Charge Coverage Ratio |  | 1.25 |  |  |  |
Debt Instrument Covenant Capital Expenditures Limitation, Amount, After Twelve Years |  |  |  |  | $ 7,500,000 |
Long-term Debt, Percentage Bearing Fluctuating Interest, Threshold Amount |  | $ 100,000 |  |  |  |
Minimum Prepayment Amount Under Line of Credit |  | $ 100,000 |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  | 0.125% |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  | 20,000,000.0 |  |  |
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.29% |  |  |  |
Debt Instrument Basis Spread on Elected Fixed Rate Borrowing |  | 1.29% |  |  |  |
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member] | Maximum [Member] |  |  |  |  |  |
Ratio of Indebtedness to Net Capital |  | 1.50 |  |  |  |
Ratio of Total Current Assets to Total Current Liabilities |  | 1.75 |  |  |  |
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member] | Term Loan [Member] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 10,000,000.0 |  |  |  |
Debt Instrument, Term (Year) |  | 7 years |  |  |  |
Debt Instrument, Amortization Period (Year) |  | 25 years |  |  |  |
Long-term Debt, Total |  |  | $ 10,000,000.0 |  |  |
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member] | Term Loan [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.80% |  |  |  |

X
- Definition Represents the amortization period for debt instrument, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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