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Note 1 - Organization and Summary of Significant Accounting Policies (Details Textual) - USD ($) |  | 12 Months Ended | 168 Months Ended
--- | --- | --- | ---
Dec. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016
Marketable Securities |  | $ 418,000 | $ 396,000 | $ 418,000
Marketable Securities, Unrealized Gain (Loss) |  | 22,000 | 68,000 |
Tangible Asset Impairment Charges |  |  | 0 |
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property |  | 1,000 |  |
Loss on Sale of Investments |  | 713,000 |  |
Cost-method Investments, Other than Temporary Impairment |  | 750,000 |  |
Cost-method Investments, Realized Gain (Loss), Excluding Other than Temporary Impairments |  | 37,000 | 2,034,000 |
Gain on Sale of Investments |  |  | 1,247,000 |
Equity Method Investment, Other than Temporary Impairment |  |  | 792,000 |
Equity Method Investments |  |  | 100,000 |
Cost Method Investments |  | 1,272,000 | 1,015,000 | $ 1,272,000
Investments, Unfunded Commitments |  | 1,000,000 |  |
Allocated Share-based Compensation Expense |  | $ 31,000 | $ 19,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 42,000 | 12,000 | 1,285,500
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  | $ 103,000 |  | $ 103,000
The 2011 Non-employee Director Stock Option Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 30,000 | 12,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  | $ 2.63 | $ 2.10 |
Privately-held Technology Company [Member] |  |  |  |
Investments, Unfunded Commitments | $ 1,000,000 |  |  |
General and Administrative Expense [Member] |  |  |  |
Depreciation |  | $ 248,000 | $ 217,000 |

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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 + Details
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