Note 6 - Restricted Cash (Tables)

3 Months Ended

Oct. 31, 2020

Notes Tables

Restrictions on Cash and Cash Equivalents [Table Text Block]

	October 31, 2020		July 31, 2020
Restricted cash, beginning of period	$	1,839,216	$	1,821,392
Interest received		44		17,824
Restricted cash, end of period	$	1,839,260	$	1,839,216

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

	October 31, 2020		October 31, 2019
Cash and cash equivalents	$	6,700,603	$	13,112,069
Restricted cash		1,839,260		1,828,921
Total cash, cash equivalents and restricted cash	$	8,539,863	$	14,940,990