Note 4 - Revenue From Contracts With Customers (Details Textual) - USD ($)	3 Months Ended	6 Months Ended
Apr. 30, 2025	Jul. 31, 2025	Jul. 31, 2024
Increase (Decrease) in Contract with Customer, Liability	$ 461,000	$ (1,822,000)	$ (495,000)
Minimum [Member]
Contract with Customers, Turn Over Period (Month)		3 months
Maximum [Member]
Contract with Customers, Turn Over Period (Month)		6 months

Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 912
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478345/912-310-45-11

Name:	us-gaap_IncreaseDecreaseInContractWithCustomerLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration