Note 15 - Share Based Awards (Tables)

6 Months Ended

Oct. 31, 2021

Share-based Payment Arrangement [Abstract]

assumptions used to calculate the fair value of options granted

The table below sets forth the assumptions used to calculate the fair value of options granted during the three months ended October 31, 2021:  

Exercise price	2.61 - 2.82
Stock price on date of grant	2.61 - 2.82
Volatility	271.7% - 273.4%
Risk-free interest rate	0.93% - 1.10%
Expected term (years)	6.56 – 8.25
Dividend yield	—

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

Options	Shares			Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term		Aggregate Intrinsic Value
Outstanding as of April 30, 2020		1,597,475		$	1.10
Granted		600,000			3.63
Exercised		—			—
Forfeited or expired		—			—
Outstanding as of April 30, 2021		2,197,475			1.79
Granted		919,000			2.68
Exercised		(112,500	)		0.96
Forfeited or expired		—			—
Outstanding as of October 31, 2021		3,003,975			2.09		8.70	$	3,096,487
Exercisable as of October 31, 2021		1,694,892		$	2.18		8.35	$	1,811,400

Stock compensation expense

Stock compensation expense was as follows:

	Three months ended October 31,				Six months ended October 31,
	2021		2020		2021		2020
General and administrative	$	389,749	$	94,629	$	609,350	$	189,258
Research and development		84,752		9,945		141,232		19,890
Operations		311,347		2,487		374,608		4,974
Sales and marketing		114,089		—		158,833		—
Total	$	899,937	$	107,061	$	1,284,023	$	214,122