Note 8 - Restricted Cash (Tables)

12 Months Ended

Jul. 31, 2022

Notes Tables

Restrictions on Cash and Cash Equivalents [Table Text Block]

	July 31, 2022			July 31, 2021
Balance, beginning of year	$	2,038		$	1,839
Restricted cash received from U1A Acquisition		13,755			-
(Release) addition of surety bond collateral		(8,550	)		199
Interest received		8			-
Balance, end of year	$	7,251		$	2,038

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

	July 31, 2022		July 31, 2021		July 31, 2020
Cash and cash equivalents	$	32,536	$	44,313	$	5,149
Restricted cash		7,251		2,038		1,839
Total cash, cash equivalents and restricted cash	$	39,787	$	46,351	$	6,988