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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restricted Cash and Cash Equivalents, Noncurrent |  | $ 2,905 |
Asset Retirement Obligation |  | 100 | 100
Property, Plant and Equipment, Net |  | $ 43,971 | $ 43,386
Weighted Average Number of Shares Outstanding, Basic |  | 3,803,331 | 3,803,331
Weighted Average Number of Shares Outstanding, Diluted |  | 3,803,000 | 3,803,000
Assuming Dilution Effect Member |  |  |
Weighted Average Number of Shares Outstanding, Diluted |  | 3,849,882 | 3,848,002
AWMS Holdings, LLC [Member] |  |  |
Equity Method Investment, Ownership Percentage |  | 47.00% | 47.00%
Annual Membership Fees [Member] |  |  |
Deferred Revenue |  | $ 2,700 | $ 2,400
Land Improvements [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life |  | 10 years |
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] |  |  |
Property, Plant and Equipment, Net |  | $ 4,300 |
Wells and Related Equipment and Facilities [Member] | Maximum [Member] | Scenario, Forecast [Member] |  |  |
Tangible Asset Impairment Charges | $ 4,300 |  |

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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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