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Note 8 - Goodwill and Intangible Assets - Summary of Intangible Assets (Details) - USD ($)
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Intangible assets, gross carrying amount $ 1,786,409   $ 1,810,076
Accumulated amortization (326,837)   (252,730)
Intangible assets, net 1,459,572   1,557,346
Amortization expense 76,807 $ 1,804  
Technology-Based Intangible Assets [Member]      
Intangible assets, gross carrying amount 639,381   648,208
Customer Relationships [Member]      
Intangible assets, gross carrying amount 611,582   620,026
Trade Names [Member]      
Intangible assets, gross carrying amount 222,394   225,464
Noncompete Agreements [Member]      
Intangible assets, gross carrying amount 240,926   244,252
Patents [Member]      
Intangible assets, gross carrying amount $ 72,126   $ 72,126