CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Assets
Allowance for doubtful accounts	$ 63,727	$ 63,727
Stockholders Equity
Preferred stock par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock shares authorized (in shares)	500,000	500,000
Preferred stock shares issued (in shares)	0	0
Preferred stock shares outstanding (in shares)	0	0
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock shares authorized (in shares)	40,000,000	40,000,000
Common stock shares issued (in shares)	32,943,848	32,757,817
Common stock shares outstanding (in shares)	32,567,321	32,381,290
Treasury stock (in shares)	376,527	376,527

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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