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v3.10.0.1

Basis of presentation (Details) - USD ($) | Sep. 30, 2018 | Jun. 05, 2018
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Accounting Policies [Abstract] |  |
Working capital surplus | $ 20,000,000 |
Revolving Loans | Citizens Bank, N.A. |  |
Line of Credit Facility [Line Items] |  |
Revolving loans, aggregate principal amount | $ 25,000,000 | $ 25,000,000.0

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