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Note 10 - Income Taxes (Details Textual) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Deferred Tax Assets, Valuation Allowance | $ 475,000 | $ 475,000 | $ 475,000
Capital Loss Carryforward [Member] |  |  |
Tax Credit Carryforward, Amount |  | 27,000 |
Research Tax Credit Carryforward [Member] |  |  |
Tax Credit Carryforward, Amount |  | $ 1,279,000 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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- Definition The amount of the tax credit 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=65882285&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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