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Note 1 - Summary of Significant Accounting Policies - Finite Lived Intangible Assets (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Gross carrying amount | $ 8,154,145 | $ 7,789,539
Accumulated amortization | 3,457,994 | 2,803,323
Net book value amount | $ 4,696,151 | $ 4,986,216
Customer Relationships [Member] |  |
Useful life (Year) | 15 years | 15 years
Gross carrying amount | $ 3,742,000 | $ 3,742,000
Accumulated amortization | 904,317 | 654,850
Net book value amount | $ 2,837,683 | $ 3,087,150
Certification Marks [Member] |  |
Useful life (Year) | 8 years | 8 years
Gross carrying amount | $ 1,068,000 | $ 1,068,000
Accumulated amortization | 483,937 | 350,437
Net book value amount | $ 584,063 | $ 717,563
Trademarks [Member] |  |
Useful life (Year) | 8 years | 8 years
Gross carrying amount | $ 563,000 | $ 563,000
Accumulated amortization | 255,109 | 184,734
Net book value amount | $ 307,891 | $ 378,266
Patents [Member] |  |
Useful life (Year) | 20 years | 20 years
Gross carrying amount | $ 790,384 | $ 689,889
Accumulated amortization | 84,660 | 56,257
Net book value amount | $ 705,724 | $ 633,632
Patents [Member] | Maximum [Member] |  |
Useful life (Year) | 20 years |
Other Intangible Assets [Member] |  |
Useful life (Year) | 5 years | 5 years
Gross carrying amount | $ 31,091 | $ 31,091
Accumulated amortization | 24,873 | 18,655
Net book value amount | 6,218 | 12,436
Computer Software, Intangible Asset [Member] |  |
Gross carrying amount | 1,959,670 | 1,695,559
Accumulated amortization | 1,705,098 | 1,538,390
Net book value amount | $ 254,572 | $ 157,169
Computer Software, Intangible Asset [Member] | Minimum [Member] |  |
Useful life (Year) | 1 year | 1 year
Computer Software, Intangible Asset [Member] | Maximum [Member] |  |
Useful life (Year) | 3 years | 3 years

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 926 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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