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Note 8 - Income Taxes - Net Deferred Tax Assets (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 01, 2016
--- | --- | --- | ---
Federal, state and foreign loss carryforwards | $ 794,000 | $ 1,440,000 |
Deferred revenue | 11,000 | 30,000 |
Federal and state tax credits | 757,000 | 642,000 |
Other | 402,000 | 823,000 |
Total deferred tax asset | 1,964,000 | 2,935,000 |
Less valuation allowance | (1,964,000) | (2,935,000) | $ (2,900,000)
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=96869850&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=84230637&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=84230637&loc=d3e32632-109319 + Details
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