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Note 7 - Income Taxes - Net Deferred Tax Assets (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Federal, state and foreign loss carryforwards | $ 1,440,000 | $ 1,850,000
Deferred revenue | 30,000 | 68,000
Deferred Tax Assets, Tax Credit Carryforwards | 642,000 | 653,000
Other | 823,000 | (79,000)
Total deferred tax asset | 2,935,000 | 2,492,000
Less valuation allowance | (2,935,000) | (2,492,000)
Net deferred tax asset |  |

X
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319 + Details
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