Note 9 - Share-based Compensation - Summary of Non-vested Options (Details)	3 Months Ended
	Jun. 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	(16,667)
Vested (in dollars per share) | $ / shares	$ 1.60
Nonvested (in shares) | shares	175,000
Nonvested (in dollars per share) | $ / shares	$ 1.48