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Accounts receivable and accrued revenues
9 Months Ended
Sep. 30, 2018
Accounts receivable and accrued revenues [Abstract]  
Accounts receivable and accrued revenues
Note 8 - Accounts receivable and accrued revenues

Accounts receivable and accrued revenues totaling $41.0 million as of September 30, 2018 consists mainly of accounts receivable with no material amounts overdue.