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Note I - Stockholders' Equity (Details Textual) - USD ($) $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 14, 2022 | Mar. 12, 2021 | Sep. 18, 2020 | Jun. 30, 2023
Stock Repurchase Program, Additional Authorized Amount | $ 3 | $ 3 | $ 2 |
Stock Repurchase Program, Authorized Amount | $ 18 | $ 15 | $ 12 |
Restricted Stock [Member] |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  |  |  | $ 2
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  | 2 years 1 month 6 days

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