Note 7 - Restricted Cash (Tables)

9 Months Ended

Apr. 30, 2021

Notes Tables

Restrictions on Cash and Cash Equivalents [Table Text Block]

	April 30, 2021		July 31, 2020
Restricted cash, beginning of period	$	1,839,216	$	1,821,392
Additional surety bond collateral		198,377		-
Interest received		84		17,824
Restricted cash, end of period	$	2,037,677	$	1,839,216

Schedule of Cash and Cash Equivalents and Restricted Cash [Table Text Block]

	April 30, 2021		April 30, 2020
Cash and cash equivalents	$	43,930,316	$	7,407,189
Restricted cash		2,037,677		1,839,119
Total cash, cash equivalents and restricted cash	$	45,967,993	$	9,246,308