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Note K - Stock-based Compensation - Shares Available for Future Options (Details) - Stock Options [Member] - shares
Jun. 30, 2021
Jun. 30, 2019
The 2020 Directors Plan [Member]    
Shares Available for Grant (in shares) 666,913 0
The 2018 Long-Term Incentive Plan [Member]    
Shares Available for Grant (in shares) 103,289 492,591