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Revolving credit line - Schedule of Notes Payable (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016
Debt Instrument [Line Items] |  |
Total | $ 5,000,000 | $ 0
Line of Credit | Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.75% |
Revolving credit line - 4.75 percent at June 30, 2017 (prime plus 0.5 percent), due September 29, 2018 - current portion | $ 2,500,000 | 0
Revolving credit line - long-term portion | 2,500,000 | $ 0
Total | $ 5,000,000 |
Prime Rate | Line of Credit | Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 0.50% |

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