Debt Securities (Details) - Schedule of available-for-sale securities - USD ($) $ in Thousands		Jan. 31, 2021	Jan. 31, 2020
Marketable Securities [Line Items]
Amortized Cost		$ 21,442	$ 18,321
Gross Unrealized Gains		85	58
Gross Unrealized Losses		(26)	(16)
Fair Value		21,501	18,363
Certificates of deposit [Member]
Marketable Securities [Line Items]
Amortized Cost	[1]	4,608	13,844
Gross Unrealized Gains	[1]	15	58
Gross Unrealized Losses	[1]
Fair Value	[1]	4,623	13,902
U.S. Treasury bills [Member]
Marketable Securities [Line Items]
Amortized Cost		3,676	2,498
Gross Unrealized Gains
Gross Unrealized Losses		(9)
Fair Value		3,667	2,498
Corporate bonds [Member]
Marketable Securities [Line Items]
Amortized Cost		6,233
Gross Unrealized Gains		68
Gross Unrealized Losses		(17)
Fair Value		6,284
Municipal bonds [Member]
Marketable Securities [Line Items]
Amortized Cost		6,925	1,979
Gross Unrealized Gains		2
Gross Unrealized Losses			(16)
Fair Value		$ 6,927	$ 1,963

[1] Each of the Company’s certificates of deposit has a CUSIP, was purchased in the secondary market through a broker and may be sold in the secondary market.