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Note 2 - Discontinued Operations (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes Paid | $ 28,000 | $ 120,000 |
Chem Free [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |  |
Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities |  |  | $ 120,000
Income Taxes Paid |  | $ 120,000 |

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