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Note 1 - Nature of Business and Significant Accounting Policies (Details Textual) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 28, 2019 | Jun. 03, 2019 | Aug. 31, 2020 USD ($) | Aug. 31, 2019 USD ($)
Number of Countries in which Entity Operates |  |  | 60 |
Number of Operating Segments |  |  | 2 |
Accounts Receivable, Allowance for Credit Loss, Ending Balance |  |  | $ 90,000 | $ 65,000
Stockholders' Equity Note, Stock Split, Conversion Ratio | 2 | 2 |  |
Natur-Tech India [Member] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  | 75.00% |
Natur Tec Lanka [Member] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  | 75.00% |
Zerust Brazil [Member] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  | 85.00% |
NTI Asean LLC [Member] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  | 60.00% |
Zerust Singapore Pte Ltd [Member] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  | 60.00% |
Zerust Vietnam Co. Ltd [Member] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  | 60.00% |
Maximum [Member] | Various Joint Ventures [Member] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  | 50.00% |

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- Definition Amount of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 + Details
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