Note 9 - Share-based Compensation - Restricted Stock Units (Details) - Restricted Stock Units (RSUs) [Member]	6 Months Ended
	Sep. 30, 2024 $ / shares shares
Nonvested restricted stock units (in shares) | shares	130,820
Nonvested restricted stock units, weighted average grant price (in dollars per share) | $ / shares	$ 1.23
Vested (in shares) | shares	(20,456)
Vested, weighted average grant price (in dollars per share) | $ / shares	$ 2.93
Forfeited (in shares) | shares	(14,767)
Forfeited, weighted average grant price (in dollars per share) | $ / shares	$ 1.08
Nonvested restricted stock units (in shares) | shares	95,597
Nonvested restricted stock units, weighted average grant price (in dollars per share) | $ / shares	$ 0.89