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Note 8 - Goodwill and Intangible Assets (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Goodwill, Impairment Loss $ 0      
Goodwill and Intangible Assets, Foreign Currency Translation Gain (Loss)     $ 21,044  
Amortization of Intangible Assets, Total 74,431 $ 76,633 $ 148,994 $ 153,440
Goodwill, Impairment Loss $ 0