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Note 8 - Stockholders' Equity - Valuation Assumptions for Stock Options (Details) - Share-Based Payment Arrangement, Option [Member] - $ / shares
Rate in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2021
Jun. 30, 2022
Dividend yield 0.00%  
Director [Member]    
Weighted-average fair value per share option (in dollars per share)   $ 1.30
Expected life (in years) (Year)   5 years
Volatility   89.20%
Risk-free interest rate   2.80%
Dividend yield   0.00%
Non-Board of Directors [Member]    
Weighted-average fair value per share option (in dollars per share)   $ 1.40
Expected life (in years) (Year)   6 years
Volatility   95.00%
Risk-free interest rate   2.80%
Dividend yield   0.00%