Schedule of Available-for-sale Securities, Unrealized Loss Position (Details) - USD ($) $ in Thousands	Jul. 31, 2023	Jul. 31, 2022
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 645	$ 547
Debt Securities, Available-for-sale, Unrealized Loss Position	41,635	21,646
Certificates of Deposit [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	4	14
Debt Securities, Available-for-sale, Unrealized Loss Position	3,356	1,986
US Treasury Bill Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	148	114
Debt Securities, Available-for-sale, Unrealized Loss Position	31,038	13,734
Government Sponsored Enterprise Notes [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	8
Debt Securities, Available-for-sale, Unrealized Loss Position	3,873
Corporate Bond Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	485	416
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 3,368	3,514
Municipal Bonds [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		3
Debt Securities, Available-for-sale, Unrealized Loss Position		$ 2,412