Note 2 - Revenue 1 (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020	Jan. 31, 2021
Contract with Customer, Liability, Revenue Recognized			$ 88,300
Revenue, Remaining Performance Obligation, Amount	$ 302,300		302,300
Capitalized Contract Cost, Amortization			2,676	$ 2,391
Capitalized Contract Cost, Impairment Loss			$ 0	0
Direct Costs of Obtaining Contract [Member]
Capitalized Contract Cost, Amortization Period (Year)	5 years		5 years
Capitalized Contract Cost, Net, Total	$ 13,500		$ 13,500		$ 13,100
Direct Costs of Obtaining Contract [Member] | Selling and Marketing Expense [Member]
Capitalized Contract Cost, Amortization	$ 1,200	$ 1,100	$ 2,400	2,100
Costs to Fulfill Contract [Member]
Capitalized Contract Cost, Amortization Period (Year)	5 years		5 years
Capitalized Contract Cost, Net, Total	$ 1,300		$ 1,300
Costs to Fulfill Contract [Member] | Cost of Sales [Member]
Capitalized Contract Cost, Amortization	$ 100	$ 200	$ 300	$ 300