Note 9 - Share-based Compensation - Summary of Non-vested Options (Details) - $ / shares	3 Months Ended	9 Months Ended
	Dec. 31, 2024	Dec. 31, 2024
Nonvested (in shares)		125,000
Nonvested (in dollars per share)		$ 1.16
Granted (in shares)	0	50,000
Granted (in dollars per share)		$ 0.15
Vested (in shares)		(75,000)
Vested (in dollars per share)		$ 1.28
Nonvested (in shares)	100,000	100,000
Nonvested (in dollars per share)	$ 0.56	$ 0.56