Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	13,750,000	13,750,000
Preferred stock, shares issued (in shares)	0	12,376,329
Preferred stock, shares outstanding (in shares)	0	8,306,278
Preferred stock, liquidation value	$ 0	$ 16,778,682
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	50,572,001	14,519,629
Common stock, shares outstanding (in shares)	50,572,001	14,519,629

Face amount or stated value per share of common stock.

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