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Note 4 - Investments (Details Textual) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 30, 2016 USD ($) | Dec. 23, 2015 | Jan. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Equity Method Investment, Other than Temporary Impairment |  |  |  |  |  |  |  |  | $ 792,000
Number of Investee Companies |  | 1 |  |  |  |  |  |  |
Cost-method Investments, Realized Gain (Loss), Excluding Other than Temporary Impairments |  |  |  |  |  |  |  | $ 37,000 | 2,034,000
Cost Method Investments |  |  |  | $ 1,015,000 |  |  | $ 1,015,000 | 1,272,000 | 1,015,000
Cost-method Investments, Other than Temporary Impairment |  |  |  |  |  |  |  | 750,000 |
Investments, Unfunded Commitments |  |  |  |  |  |  |  | $ 1,000,000 |
Lumense Inc. [Member] |  |  |  |  |  |  |  |  |
Cost Method Investments |  |  |  |  | $ 0 | $ 50,000 |  |  |
Cost-method Investments, Other than Temporary Impairment |  |  |  |  | $ 50,000 | $ 700,000 |  |  |
Privately-held Technology Company [Member] |  |  |  |  |  |  |  |  |
Investments, Unfunded Commitments | $ 1,000,000 |  |  |  |  |  |  |  |
Investment, Unfunded Commitments, to Be Held in Escrow | $ 500,000 |  |  |  |  |  |  |  |
NKD Enterprises LLC [Member] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  | 25.50% |  |  | 25.50% | 25.50% | 25.50%
Equity Method Investment, Other than Temporary Impairment |  |  |  | $ 792,000 |  |  |  |  |
Lancope, Inc. [Member] |  |  |  |  |  |  |  |  |
Cost-method Investments, Realized Gain (Loss), Excluding Other than Temporary Impairments |  |  |  |  |  |  | $ 2,034,000 |  |
Cost Method Investments |  |  |  | 214,000 |  |  | 214,000 |  | $ 214,000
Proceeds from Sale of Other Investments |  |  | $ 2,248,000 |  |  |  |  |  |
Held Escrow Period |  |  |  |  |  |  |  |  | 1 year 180 days
Estimated Portion of Escrow |  |  |  | $ 390,000 |  |  | $ 390,000 |  | $ 390,000

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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 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594 + 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 + 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 equity 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 subject to the equity accounting method. 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=64825282&loc=d3e32787-111569 + Details
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