Note 3 - Accounts Receivable	3 Months Ended
Apr. 30, 2024
Notes to Financial Statements
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	Note 3 - Accounts receivable The majority of the Company's accounts receivable are due from geographically dispersed contractors and manufacturing companies. Credit is extended based on an evaluation of a customer's financial condition. In the United States, collateral is not generally required. In the United Arab Emirates ("U.A.E."), Saudi Arabia, Egypt and India letters of credit are usually obtained for significant orders. Accounts receivable are due within various time periods specified in the terms applicable to the specific customer and are stated as amounts due from customers net of an allowance for claims and doubtful accounts. Standard payment terms are generally net 30 to 60 days. The allowance for doubtful accounts is based on specifically identified amounts in customers' accounts, where future collectability is deemed uncertain. Management may exercise its judgment in adjusting the provision as a consequence of known items, such as current economic factors and credit trends. Past due trade accounts receivable balances are written off when the Company's collection efforts have been unsuccessful in collecting the amount due and the amount is deemed uncollectible. The write off is recorded against the allowance for doubtful accounts. In 2015, the Company completed a project in the Middle East with billings in the aggregate amount of approximately $41.9 million. The system has not yet been commissioned by the customer. Nevertheless, the Company has settled approximately $40.1 million as of April 30, 2024, with a remaining balance due in the amount of $1.8 million, all of which pertains to retention clauses within the agreements with the Company's customer, and which become payable by the customer when this project is fully tested and commissioned. Of this amount, $1.0 million is classified in other long-term assets on the Company's consolidated balance sheets. The Company has been actively involved in ongoing efforts to collect this outstanding balance. The Company continues to engage with the customer to ensure full payment of the open balances, and during the three months ended April 30, 2024, and at various times throughout 2023, the Company received partial payments to settle $0.3 million and $0.6 million, respectively, of the customer's outstanding balances. Further, the Company has been engaged by the customer to perform additional work in 2024 under customary trade terms that supports the continued cooperation between the Company and the customer. As a result, the Company did not reserve any allowance against the remaining outstanding balances as of April 30, 2024. However, if the Company's efforts to collect on this account are not successful, the Company may recognize an allowance for all, or substantially all, of any such then uncollected amounts. For the three months ended April 30, 2024 and 2023, respectively, no one customer accounted for greater than 10% of the Company's consolidated net sales. As of April 30, 2024 and January 31, 2024, one customer accounted for 11% of the Company's accounts receivable, and one customer accounted for 12% of the Company's accounts receivable, respectively.

Note 3 - Accounts Receivable

3 Months Ended

Apr. 30, 2024

Loans, Notes, Trade and Other Receivables Disclosure [Text Block]

Note 3 - Accounts receivable

The majority of the Company's accounts receivable are due from geographically dispersed contractors and manufacturing companies. Credit is extended based on an evaluation of a customer's financial condition. In the United States, collateral is not generally required. In the United Arab Emirates ("U.A.E."), Saudi Arabia, Egypt and India letters of credit are usually obtained for significant orders. Accounts receivable are due within various time periods specified in the terms applicable to the specific customer and are stated as amounts due from customers net of an allowance for claims and doubtful accounts. Standard payment terms are generally net 30 to 60 days. The allowance for doubtful accounts is based on specifically identified amounts in customers' accounts, where future collectability is deemed uncertain. Management may exercise its judgment in adjusting the provision as a consequence of known items, such as current economic factors and credit trends. Past due trade accounts receivable balances are written off when the Company's collection efforts have been unsuccessful in collecting the amount due and the amount is deemed uncollectible. The write off is recorded against the allowance for doubtful accounts.

In 2015, the Company completed a project in the Middle East with billings in the aggregate amount of approximately $41.9 million. The system has not yet been commissioned by the customer. Nevertheless, the Company has settled approximately $40.1 million as of April 30, 2024, with a remaining balance due in the amount of $1.8 million, all of which pertains to retention clauses within the agreements with the Company's customer, and which become payable by the customer when this project is fully tested and commissioned. Of this amount, $1.0 million is classified in other long-term assets on the Company's consolidated balance sheets.

The Company has been actively involved in ongoing efforts to collect this outstanding balance. The Company continues to engage with the customer to ensure full payment of the open balances, and during the three months ended April 30, 2024, and at various times throughout 2023, the Company received partial payments to settle $0.3 million and $0.6 million, respectively, of the customer's outstanding balances. Further, the Company has been engaged by the customer to perform additional work in 2024 under customary trade terms that supports the continued cooperation between the Company and the customer. As a result, the Company did not reserve any allowance against the remaining outstanding balances as of April 30, 2024. However, if the Company's efforts to collect on this account are not successful, the Company may recognize an allowance for all, or substantially all, of any such then uncollected amounts.

For the three months ended April 30, 2024 and 2023, respectively, no one customer accounted for greater than 10% of the Company's consolidated net sales.

As of April 30, 2024 and January 31, 2024, one customer accounted for 11% of the Company's accounts receivable, and one customer accounted for 12% of the Company's accounts receivable, respectively.