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Note 7 - Concentrations (Details Textual) | 12 Months Ended
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Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 | Sep. 30, 2020
Property, Plant and Equipment, Net | $ 21,527,000 | $ 18,229,000 |  |
MEXICO |  |  |  |
Property, Plant and Equipment, Net | 7,003,000 | 4,213,000 |  |
Oulu, Finland [Member] | Nestor Cables [Member] |  |  |  |
Property, Plant and Equipment, Net | 6,703,000 | 6,916,000 |  |
Keila, Estonia [Member] | Nestor Cables [Member] |  |  |  |
Property, Plant and Equipment, Net | $ 660,000 | $ 280,000 |  |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] |  |  |  |
Number of Major Customers | 1 | 1 | 2 | 2
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | One Customer [Member] |  |  |  |
Concentration Risk, Percentage | 16.00% | 14.00% |  |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Two Customers [Member] |  |  |  |
Concentration Risk, Percentage |  |  | 28.00% |
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |  |
Number of Major Customers | 3 | 1 |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | One Customer [Member] |  |  |  |
Concentration Risk, Percentage |  | 20.00% |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer One [Member] |  |  |  |
Concentration Risk, Percentage | 16.00% |  |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Two [Member] |  |  |  |
Concentration Risk, Percentage | 13.00% |  |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Three [Member] |  |  |  |
Concentration Risk, Percentage | 11.00% |  |  |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-21 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-20 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482861/275-10-50-18 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482861/275-10-50-20 + Details
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