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Revolving credit line Revolving credit line (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Schedule of Revolving Credit Line | The following table summarizes our revolving credit line balance:
|  | December 31, 2017 |  | December 31, 2016
Revolving credit line - 5.25 percent at December 31, 2017 (prime plus 0.75 percent), due September 29, 2018 - current portion |  | $ | 4,900,000 |  |  | $ | — |
Total |  | $ | 4,900,000 |  |  | $ | — |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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