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Note 4 - Concentrations (Details Textual) | 12 Months Ended
--- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Property, Plant and Equipment, Net, Ending Balance | $ 4,997,658 | $ 4,952,819
MEXICO |  |
Property, Plant and Equipment, Net, Ending Balance | $ 1,768,837 | $ 1,686,209
Revenue Benchmark [Member] | Customer Concentration Risk [Member] |  |
Number of Major Customers | 2 | 2
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Two Customers [Member] |  |
Concentration Risk, Percentage | 28.00% | 30.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |
Number of Major Customers | 1 | 2
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Two Customers [Member] |  |
Concentration Risk, Percentage |  | 25.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | One Customer [Member] |  |
Concentration Risk, Percentage | 17.00% |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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