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Note 15 - Stockholders' Equity - Option Activity (Details) - $ / shares
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Outstanding, options (in shares) 2,266,667  
Number of options granted (in shares) 0 25,000
Weighted-average exercise price per share (in dollars per share) $ 0 $ 1.75
Outstanding, options (in shares) 2,201,667 2,266,667
Share-Based Payment Arrangement, Nonemployee [Member]    
Outstanding, options (in shares) 25,000 25,000
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 4 $ 4
Number of options granted (in shares) 0 0
Weighted-average exercise price per share (in dollars per share) $ 0 $ 0
Exercised, options (in shares) 0 0
Exercised, Weighted Average Exercise Price (in dollars per share) $ 0 $ 0
Forfeited or expired, options (in shares) 0 0
Forfeited or expired, Weighted Average Exercise Price (in dollars per share) $ 0 $ 0
Outstanding, options (in shares) 25,000 25,000
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 4 $ 4
Exercisable, options (in shares) 25,000  
Exercisable, Weighted Average Exercise Price (in dollars per share) $ 4  
The 2016 Equity Incentive Plan [Member] | Share-Based Payment Arrangement, Employee [Member]    
Outstanding, options (in shares) 2,266,667 2,416,667
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 3.73 $ 3.75
Number of options granted (in shares) 0 25,000
Weighted-average exercise price per share (in dollars per share) $ 0 $ 1.75
Exercised, options (in shares) 0 (10,000)
Exercised, Weighted Average Exercise Price (in dollars per share) $ 0 $ 0.81
Forfeited or expired, options (in shares) (65,000) (165,000)
Forfeited or expired, Weighted Average Exercise Price (in dollars per share) $ 3.88 $ 3.88
Outstanding, options (in shares) 2,201,667 2,266,667
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 3.72 $ 3.73
Exercisable, options (in shares) 2,191,667  
Exercisable, Weighted Average Exercise Price (in dollars per share) $ 3.72