Note 2 - Revenue 1 (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 31, 2018	Jul. 31, 2018	Jul. 31, 2017	Jan. 31, 2018
Contract with Customer, Liability, Revenue Recognized	$ 49,700	$ 99,900
Capitalized Contract Cost, Amortization		2,051
Capitalized Contract Cost, Impairment Loss	$ 0	$ 0
Direct Costs of Obtaining Contract [Member]
Capitalized Contract Cost, Amortization Period	5 years	5 years
Capitalized Contract Cost, Net, Total	$ 10,600	$ 10,600		$ 10,100
Direct Costs of Obtaining Contract [Member] \| Selling and Marketing Expense [Member]
Capitalized Contract Cost, Amortization	$ 900	$ 1,800
Costs to Fulfill Contract [Member]
Capitalized Contract Cost, Amortization Period	5 years	5 years
Capitalized Contract Cost, Net, Total	$ 1,600	$ 1,600		$ 1,500
Costs to Fulfill Contract [Member] \| Cost of Sales [Member]
Capitalized Contract Cost, Amortization	$ 100	$ 300

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131251-203054

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Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
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