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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Restricted Cash and Cash Equivalents, Noncurrent, Total | $ 502 | $ 502 | $ 2,826
Asset Retirement Obligation, Ending Balance | $ 100 | 100 | 100
Asset Impairment Charges, Total |  | 3,261 |
Cash Expenditure, Impairment Charges |  | $ 0 |
AWMS Holdings, LLC [Member] |  |  |
Equity Method Investment, Ownership Percentage | 47.00% | 47.00% | 47.00%
Land and Land Improvements [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life |  | 10 years |
Land and Land Improvements [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life |  | 30 years |
Building and Building Improvements [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life |  | 5 years |
Building and Building Improvements [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life |  | 50 years |
Machinery and Equipment [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |
Machinery and Equipment [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life |  | 10 years |
Wells and Related Equipment and Facilities [Member] |  |  |
Asset Impairment Charges, Total | $ 3,300 | $ 3,300 |

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