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Note 4 - Investments (Details Textual) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 30, 2016 USD ($) | Jan. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2015 USD ($)
Cost-method Investments, Realized Gain (Loss), Excluding Other than Temporary Impairments, Total |  |  |  |  |  |  | $ 1,466,000 |
Cost Method Investments |  |  | $ 1,035,000 |  |  | $ 760,000 | 1,035,000 |
Cost-method Investments, Other than Temporary Impairment |  |  |  |  |  | 363,000 | 103,000 |
Gain (Loss) on Sale of Investments, Total |  |  |  |  |  |  | $ 1,838,000 |
Privately-held Technology Company [Member] |  |  |  |  |  |  |  |
Cost Method Investments |  |  |  | $ 98,000 |  |  |  |
Investments, Unfunded Commitments | $ 1,000,000 |  |  |  |  |  |  |
Investment, Unfunded Commitments, to Be Held in Escrow | $ 500,000 |  |  |  |  |  |  |
Cost Method Investments, Percent Sold |  |  |  | 91.00% |  |  |  |
Gain (Loss) on Sale of Investments, Total |  |  |  | $ 1,466,000 |  |  |  |
Lumense Inc. [Member] |  |  |  |  |  |  |  |
Cost-method Investments, Other than Temporary Impairment |  |  |  |  | $ 250,000 | $ 250,000 |  |
Final Inc. [Member] |  |  |  |  |  |  |  |
Cost-method Investments, Other than Temporary Impairment |  |  | $ 10,000 |  | $ 90,000 |  |  |
NKD Enterprises LLC [Member] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 25.50% |  |  | 25.50% | 25.50% |
Equity Method Investments |  |  | $ 25,000 |  |  | $ 0 | $ 25,000 |
Lancope, Inc. [Member] |  |  |  |  |  |  |  |
Number of Investee Companies |  |  |  |  |  |  |  | 1
Cost-method Investments, Realized Gain (Loss), Excluding Other than Temporary Impairments, Total |  |  |  |  |  |  |  | $ 2,034,000
Cost Method Investments |  |  |  |  |  |  |  | $ 214,000
Proceeds from Sale of Other Investments |  | $ 2,248,000 |  |  |  |  |  |
Held Escrow Period |  |  |  |  |  |  |  | 1 year 180 days
Proceeds From Issuance of Restricted Cash |  |  |  | $ 372,000 |  |  |  |

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- Definition Duration of a period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days, that the portion of the sale proceeds is being held in escrow. + References No definition available. + Details
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- Definition The amount of unfunded commitments for which the entity is obligated to pay in connection to an investment that will be held in an escrow account upon funding. + References No definition available. + Details
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- Definition The amount of unfunded commitments for which the entity is obligated to pay in connection to an investment. + References No definition available. + Details
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- Definition Number of investee companies reported by the entity. + References No definition available. + Details
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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + References No definition available. + Details
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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the cost method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References No definition available. + Details
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- Definition This item represents the gain (loss) realized during the period from the sale of investments accounted for under the cost method of accounting. + References No definition available. + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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