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Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Accounts receivable, allowance for doubtful accounts $ 309 $ 1,967
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.0005 $ 0.0005
Common stock, shares authorized (in shares) 200,000,000 200,000,000
Common stock, shares issued (in shares) 79,908,985 78,642,078
Common stock, shares outstanding (in shares) 76,292,587 75,873,679
Treasury stock, shares (in shares) 3,616,398 2,768,399