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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
Dec. 31, 2019
Sep. 30, 2019
Statement of Financial Position [Abstract]    
Accounts receivable, allowance for uncollectibles $ 253,076 $ 110,743
Common stock, par value (in dollars per share) $ 5 $ 5
Common stock, shares authorized 10,000,000 10,000,000
Common stock, shares issued 8,091,317 8,073,264
Common stock, shares outstanding 8,091,317 8,073,264
Preferred stock, par value (in dollars per share) $ 0 $ 0
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0