Note 9 - Share-based Compensation - Summary of Non-vested Options (Details)	6 Months Ended
	Sep. 30, 2022 $ / shares shares
Nonvested (in shares) | shares	141,667
Nonvested (in dollars per share) | $ / shares	$ 1.33
Granted (in shares) | shares	50,000
Granted (in dollars per share) | $ / shares	$ 1.94
Vested (in shares) | shares	(50,000)
Vested (in dollars per share) | $ / shares	$ 1.33
Nonvested (in shares) | shares	141,667
Nonvested (in dollars per share) | $ / shares	$ 1.55