Note 2 - Revenue 1 (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Jan. 31, 2020
Contract with Customer, Liability, Revenue Recognized			$ 108,300
Revenue, Remaining Performance Obligation, Amount	$ 269,200		269,200
Capitalized Contract Cost, Amortization			3,633	$ 3,301
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	$ 12,400		$ 12,400		$ 12,300
Direct Costs of Obtaining Contract [Member] | Selling and Marketing Expense [Member]
Capitalized Contract Cost, Amortization	$ 1,100	$ 1,000	$ 3,200	2,900
Costs to Fulfill Contract [Member]
Capitalized Contract Cost, Amortization Period (Year)	5 years		5 years		5 years
Capitalized Contract Cost, Net, Total	$ 1,400		$ 1,400		$ 1,400
Costs to Fulfill Contract [Member] | Cost of Sales [Member]
Capitalized Contract Cost, Amortization	$ 200	$ 100	$ 400	$ 400