Note 9 - Share-based Compensation (Tables)

3 Months Ended

Jun. 30, 2022

Notes Tables

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

	As of June 30, 2022
	Authorized		Available		Outstanding
2016 Plan		1,300,000		944,938		247,868
2014 Directors Plan		650,000		287,695		12,000
2005 Plan		—		—		49,500
2004 Directors Plan		—		—		6,000
Total		1,950,000		1,232,633		315,368

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, 2022		252,500	$	3.34		6.5	$	159,650
Granted		50,000	$	3.43
Outstanding at June 30, 2022		302,500	$	3.36		6.9	$	78,400
Exercisable at June 30, 2022		127,500	$	4.17		4.3	$	25,316

Schedule of Nonvested Share Activity [Table Text Block]

Nonvested Options	Shares			Weighted Average Grant-Date Fair Value
Nonvested at March 31, 2022		141,667		$	1.33
Granted		50,000			1.94
Vested		(16,667	)		1.60
Nonvested at June 30, 2022		175,000		$	1.48

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, 2022		14,465		$	2.22
Granted		850			3.03
Vested		(2,277	)		2.29
Forfeited		(170	)		2.52
Nonvested restricted stock units at June 30, 2022		12,868		$	2.26