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Note 9 - Related-party Debt | 3 Months Ended
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Sep. 30, 2023
Notes to Financial Statements |
Debt Disclosure [Text Block] | (9) Related-party Debt On September 5, 2022, the secured promissory issued by the Company on September 5, 2019 (the “2019 Note”) to Thomas B. Pickens III, the Chief Executive Officer and Chairman of the Board of Directors of the Company, matured. On the maturity date, the remaining outstanding principal amount of $500 thousand and accrued interest of $55 thousand on the 2019 Note was paid in full and the 2019 Note was canceled. With the cancelation of the 2019 Note, the Amended Subsidiary Guarantee was terminated and the Subsidiaries’ Collateral was released. Refer to Note 7 of our Annual Report on Form 10-K for 2023 for more detailed information on the 2019 Note.

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