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Consolidated Balance Sheet (Parentheticals) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Allowance for parts and supplies | $ 1,595 | $ 795
Preferred stock, par value (in dollars per share) | $ 0.10 | $ 0.10
Preferred stock, authorized | 10,000,000 | 10,000,000
Preferred stock, issued | 0 | 0
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, shares authorized | 100,000,000 | 100,000,000
Common stock, outstanding | 30,245,000 | 29,955,000

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