Note 12 - Stock-based Compensation - Compensation Expense Related to Stock Options (Details) - Share-based Payment Arrangement, Option [Member]	9 Months Ended
Jun. 30, 2020 USD ($)
Fiscal Year 2017 [Member]
Compensation expense	$ (5,652)
Fiscal Year 2019 [Member]
Compensation expense	$ (1,476)

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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