Consolidated Balance Sheets (UNAUDITED) (Parentheticals) - $ / shares	Jun. 30, 2018	Dec. 31, 2017
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, par or stated value (usd per share)	$ 0.001	$ 0.001
Preferred stock shares authorized, shares	50,000,000	50,000,000
Preferred stock shares issued, shares	0	0
Common stock, par or stated value (usd per share)	$ 0.001	$ 0.001
Common stock shares authorized, shares	900,000,000	900,000,000
Common stock shares outstanding, shares	352,910,073	349,899,827

Face amount or stated value per share of common stock.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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