Basis of Presentation and Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2017
Accounting Policies [Abstract]
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]	Restricted Cash Restricted cash reported in our Condensed Consolidated Balance Sheet at June 30, 2017 relates to net proceeds from the sale of our lubricant operations located in Arizona and Nevada during the second quarter of 2017. This cash is restricted through June 30, 2018 and must be used to reinvest in assets used in our business or as a prepayment of debt.
Fair Value of Financial Instruments, Policy [Policy Text Block]	Financial Instruments and Fair Value Financial instruments that potentially subject us to concentrations of credit risk consist of accounts receivable. We believe that our credit risk is minimized as a result of the credit quality of our customer base. The carrying amounts of cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities, which we consider Level 1 assets, approximated their fair values at June 30, 2017 and December 31, 2016, due to their short-term maturities.
Use of Estimates, Policy [Policy Text Block]	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Basis of Presentation and Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2017

Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]

Restricted Cash

Restricted cash reported in our Condensed Consolidated Balance Sheet at June 30, 2017 relates to net proceeds from the sale of our lubricant operations located in Arizona and Nevada during the second quarter of 2017. This cash is restricted through June 30, 2018 and must be used to reinvest in assets used in our business or as a prepayment of debt.

Fair Value of Financial Instruments, Policy [Policy Text Block]

Financial Instruments and Fair Value

Financial instruments that potentially subject us to concentrations of credit risk consist of accounts receivable. We believe that our credit risk is minimized as a result of the credit quality of our customer base. The carrying amounts of cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities, which we consider Level 1 assets, approximated their fair values at June 30, 2017 and December 31, 2016, due to their short-term maturities.

Use of Estimates, Policy [Policy Text Block]

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.