Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Accounts receivable, allowance	$ 4,534	$ 2,651
Notes payable and current portion of long-term debt, unamortized discount	$ 2,000	$ 3,797
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	500,000,000	500,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	5,000,000,000	5,000,000,000
Common stock, shares issued (in shares)	390,449,879	390,449,879
Treasury stock, shares (in shares)	134,806,051	134,806,051

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

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