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Note 8 - Goodwill and Intangible Assets - Summary of Intangible Assets (Details) - USD ($)
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Intangible assets, gross carrying amount $ 1,710,431 $ 1,810,076
Accumulated amortization (534,797) (252,730)
Intangible assets, net 1,175,634 1,557,346
Amortization Expense 303,397 231,901
Technology-Based Intangible Assets [Member]    
Intangible assets, gross carrying amount 611,043 648,208
Customer Relationships [Member]    
Intangible assets, gross carrying amount 584,477 620,026
Trade Names [Member]    
Intangible assets, gross carrying amount 212,537 225,464
Noncompete Agreements [Member]    
Intangible assets, gross carrying amount 230,248 244,252
Patents [Member]    
Intangible assets, gross carrying amount $ 72,126 $ 72,126