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Note 1 - Organization and Summary of Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended | 154 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2015
General and Administrative Expense [Member] |  |  |
Depreciation | $ 217,000 | $ 155,000 |
The 2011 Non-Employee Directors Stock Option Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 12,000 | 16,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 2.10 | $ 1.06 |
Tangible Asset Impairment Charges | $ 0 | $ 0 |
Marketable Securities | 396,000 | 463,000 | $ 396,000
Marketable Securities, Unrealized Gain (Loss) | 68,000 | 20,000 |
Gain on Sale of Investments | 1,247,000 |  |
Cost-method Investments, Realized Gain (Loss), Excluding Other than Temporary Impairments | 2,034,000 | 145,000 |
Equity Method Investment, Other than Temporary Impairment | 792,000 |  |
Equity Method Investments | 100,000 |  | 100,000
Cost-method Investments, Other than Temporary Impairment |  | 17,000 |
Cost Method Investments | 1,015,000 | 1,605,000 | $ 1,015,000
Allocated Share-based Compensation Expense | $ 19,000 | $ 49,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 12,000 | 16,000 | 1,243,500
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 23,000 |  | $ 23,000

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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