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Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Allowance for doubtful accounts | $ 1,441 | $ 1,411
Accumulated depreciation | 26,758 | 26,528
Accumulated amortization | $ 6,640 | $ 6,608
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, shares authorized (in shares) | 40,000,000 | 40,000,000
Common stock, shares issued (in shares) | 24,833,383 | 24,825,891
Common stock outstanding (in shares) | 24,186,824 | 24,170,585

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