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CONDENSED BALANCE SHEETS (Parenthetical) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
CONDENSED BALANCE SHEETS    
Accounts receivable, allowance for doubtful accounts $ 57,567 $ 42,443
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares authorized 31,500,000 31,500,000
Common stock, shares issued 11,196,402 10,989,111
Common stock, shares outstanding 11,196,402 10,989,111