Note 9 - Share-based Compensation (Tables)

6 Months Ended

Sep. 30, 2024

Notes Tables

Schedule of Share-based Compensation Shares Authorized Available and Outstanding by Plan [Table Text Block]

	As of September 30, 2024
	Authorized		Available		Outstanding
2016 Plan		1,300,000		600,446		430,597
2024 Directors Plan		800,000		617,284		182,716
2014 Directors Plan		—		—		12,000
Total		2,100,000		1,217,730		625,313

Share-Based Payment Arrangement, Option, Activity [Table Text Block]

Option Activity	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value
Outstanding at March 31, 2024		297,000	$	2.47		7.1	$	—
Granted		50,000		0.78
Outstanding at September 30, 2024		347,000	$	2.23		6.7	$	—
Exercisable at September 30, 2024		247,000	$	2.64		5.6	$	—

Schedule of Nonvested Share Activity [Table Text Block]

Nonvested Options	Shares			Weighted Average Grant-Date Fair Value
Nonvested at March 31, 2024		125,000		$	1.16
Granted		50,000			0.15
Vested		(75,000	)		1.28
Nonvested at September 30, 2024		100,000		$	0.56

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

Nonvested Restricted Stock Units	Shares			Weighted Average Grant Price
Nonvested restricted stock units at March 31, 2024		130,820		$	1.23
Vested		(20,456	)		2.93
Forfeited		(14,767	)		1.08
Nonvested restricted stock units at September 30, 2024		95,597		$	0.89