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Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Accounts receivable, allowance for doubtful accounts $ 326 $ 368
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) 82,440,259 80,295,141
Common stock, shares outstanding (in shares) 78,371,427 76,349,274
Treasury stock, shares (in shares) 4,068,832 3,945,867