Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Allowance for doubtful accounts	$ 53,513	$ 27,666
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares issued (in shares)	131,124,989	73,674,703
Common stock, shares outstanding (in shares)	131,124,989	73,674,703

Amount of allowance for credit loss on accounts receivable, classified as current.

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