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Note 6 - Intangible Assets - Schedule of Intangible Assets (Details) (Parentheticals)
 6 Months Ended
Mar. 31, 2020
Customer Relationships [Member]  
Finite-lived intangible asset, useful life (Year) 10 years
Trade Names [Member]  
Finite-lived intangible asset, useful life (Year) 10 years
Noncompete Agreements [Member]  
Finite-lived intangible asset, useful life (Year) 3 years