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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 ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Cost-method Investments, Realized Gain (Loss), Excluding Other than Temporary Impairments								$ 1,466,000	$ 37,000
Cost Method Investments			$ 1,035,000					1,035,000	1,272,000
Cost-method Investments, Other than Temporary Impairment								103,000	750,000
Investments, Unfunded Commitments									1,000,000
Gain (Loss) on Sale of Investments								$ 1,838,000
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]
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				$ 1,466,000
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%
Lancope, Inc. [Member]
Number of Investee Companies										1
Cost-method Investments, Realized Gain (Loss), Excluding Other than Temporary Impairments										$ 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

X

- Definition

The percentage of cost method investments sold during the period.

+ References

No definition available.

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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.

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X

- 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.

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- Definition

Number of investee companies reported by the entity.

+ References

No definition available.

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- Definition

The cash inflow from the issuance of restricted cash back to the company from certain holding accounts.

+ References

No definition available.

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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=75025870&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=75027002&loc=d3e40346-111594

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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=75025870&loc=d3e40691-111596

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(9)(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3))
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(c))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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Amount of cash inflow from the sale of investments classified as other.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
-Paragraph 26
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585

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