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Note 8 - Income Taxes - Net Operating Loss Carryforwards (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Operating Loss Carryforwards | $ 3,783 | $ 4,116
Operating Loss Carryforward Expiring in 2021 [Member] |  |
Operating Loss Carryforwards | 689 | 689
Operating Loss Carryforward Expiring in 2022 [Member] |  |
Operating Loss Carryforwards | 849 | 849
Operating Loss Carryforward Expiring in 2034 [Member] |  |
Operating Loss Carryforwards | $ 2,245 | $ 2,578

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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