Annual report pursuant to Section 13 and 15(d)

Note 9 - Stock-based Compensation - Stock Options by Exercise Prices Range (Details)

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Note 9 - Stock-based Compensation - Stock Options by Exercise Prices Range (Details)
 12 Months Ended
Mar. 31, 2024
$ / shares
shares
Number of Options Outstanding (in shares) | shares 895,500
Weighted- Avg. Remaining Contractual Life in Years (Year) 5 years 11 months 15 days
Weighted- Avg. Exercise Price of Options Outstanding (in dollars per share) $ 6.93
Number of Options Exercisable (in shares) | shares 665,500
Weighted- Avg. Exercise Price of Options Exercisable (in dollars per share) $ 7.41
Price Range 1 [Member]  
Exercise Price Range, Lower Range Limit (in dollars per share) 4
Exercise Price Range, Upper Range Limit (in dollars per share) $ 4.99
Number of Options Outstanding (in shares) | shares 105,000
Weighted- Avg. Remaining Contractual Life in Years (Year) 6 years 1 month 2 days
Weighted- Avg. Exercise Price of Options Outstanding (in dollars per share) $ 4.78
Number of Options Exercisable (in shares) | shares 95,000
Weighted- Avg. Exercise Price of Options Exercisable (in dollars per share) $ 4.84
Price Range 2 [Member]  
Exercise Price Range, Lower Range Limit (in dollars per share) 5
Exercise Price Range, Upper Range Limit (in dollars per share) $ 5.99
Number of Options Outstanding (in shares) | shares 180,000
Weighted- Avg. Remaining Contractual Life in Years (Year) 8 years 10 months 2 days
Weighted- Avg. Exercise Price of Options Outstanding (in dollars per share) $ 5.33
Number of Options Exercisable (in shares) | shares 20,000
Weighted- Avg. Exercise Price of Options Exercisable (in dollars per share) $ 5.9
Price Range 3 [Member]  
Exercise Price Range, Lower Range Limit (in dollars per share) 6
Exercise Price Range, Upper Range Limit (in dollars per share) $ 6.99
Number of Options Outstanding (in shares) | shares 120,000
Weighted- Avg. Remaining Contractual Life in Years (Year) 8 years 2 months 8 days
Weighted- Avg. Exercise Price of Options Outstanding (in dollars per share) $ 6.54
Number of Options Exercisable (in shares) | shares 60,000
Weighted- Avg. Exercise Price of Options Exercisable (in dollars per share) $ 6.54
Price Range 4 [Member]  
Exercise Price Range, Lower Range Limit (in dollars per share) 7
Exercise Price Range, Upper Range Limit (in dollars per share) $ 7.99
Number of Options Outstanding (in shares) | shares 365,500
Weighted- Avg. Remaining Contractual Life in Years (Year) 5 years 2 months 19 days
Weighted- Avg. Exercise Price of Options Outstanding (in dollars per share) $ 7.74
Number of Options Exercisable (in shares) | shares 365,500
Weighted- Avg. Exercise Price of Options Exercisable (in dollars per share) $ 7.74
Price Range 5 [Member]  
Exercise Price Range, Lower Range Limit (in dollars per share) 8
Exercise Price Range, Upper Range Limit (in dollars per share) $ 8.99
Number of Options Outstanding (in shares) | shares 55,000
Weighted- Avg. Remaining Contractual Life in Years (Year) 1 year 2 months 12 days
Weighted- Avg. Exercise Price of Options Outstanding (in dollars per share) $ 8.38
Number of Options Exercisable (in shares) | shares 55,000
Weighted- Avg. Exercise Price of Options Exercisable (in dollars per share) $ 8.38
Price Range 6 [Member]  
Exercise Price Range, Lower Range Limit (in dollars per share) 9
Exercise Price Range, Upper Range Limit (in dollars per share) $ 9.99
Number of Options Outstanding (in shares) | shares 70,000
Weighted- Avg. Remaining Contractual Life in Years (Year) 2 years 2 months 8 days
Weighted- Avg. Exercise Price of Options Outstanding (in dollars per share) $ 9.6
Number of Options Exercisable (in shares) | shares 70,000
Weighted- Avg. Exercise Price of Options Exercisable (in dollars per share) $ 9.6