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Note 3 - Accounts Receivable (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2020 USD ($) | Apr. 30, 2020 USD ($) | Oct. 31, 2019 | Oct. 31, 2020 USD ($) | Oct. 31, 2019 | Jan. 31, 2020 USD ($)
Accounts Receivable, Outstanding for Several Years | $ 3,900 |  |  | $ 3,900 |  | $ 4,100
Retention Receivable | 3,400 |  |  | 3,400 |  |
Accounts Receivable, Certified Invoices in Process of Collection |  | $ 500 |  |  |  |
Proceeds from Collection of Accounts Receivable Outstanding for Several Years | 200 |  |  |  |  |
Allowance for Doubtful Accounts Receivable Outstanding for Several Years | $ 0 |  |  | $ 0 |  |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |
Number of Major Customers | 0 |  | 1 | 0 | 1 |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | One Customer [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  |  | 16.00% |  | 11.00% |
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |
Number of Major Customers | 1 |  |  |  |  | 1
Accounts Receivable [Member] | Customer Concentration Risk [Member] | One Customer [Member] |  |  |  |  |  |
Concentration Risk, Percentage | 10.10% |  |  |  |  | 13.30%
Other Noncurrent Assets [Member] |  |  |  |  |  |
Retention Receivable | $ 1,600 |  |  | $ 1,600 |  | $ 2,100

X
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X
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X
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X
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