Note 6 - Restricted Cash (Tables)

6 Months Ended

Jan. 31, 2021

Notes Tables

Restrictions on Cash and Cash Equivalents [Table Text Block]

	January 31, 2021		July 31, 2020
Restricted cash, beginning of period	$	1,839,216	$	1,821,392
Interest received		84		17,824
Restricted cash, end of period	$	1,839,300	$	1,839,216

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

	January 31, 2021		January 31, 2020
Cash and cash equivalents	$	8,713,193	$	10,272,315
Restricted cash		1,839,300		1,834,746
Total cash, cash equivalents and restricted cash	$	10,552,493	$	12,107,061