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Note 1 - Organization and Summary of Significant Accounting Policies (Details Textual) - USD ($)		12 Months Ended		180 Months Ended
	Dec. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Sep. 30, 2017
Marketable Securities		$ 438,000	$ 418,000	$ 438,000
Marketable Securities, Unrealized Gain (Loss)		23,000	22,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property		2,000	1,000
Gain on Sale of Investments		1,738,000
Cost-method Investments, Realized Gain (Loss), Excluding Other than Temporary Impairments		1,466,000	37,000
Gain Funds Held in Escrow Released		372,000
Cost-method Investments, Other than Temporary Impairment		103,000	750,000
Loss on Sale of Investments			713,000
Cost Method Investments		1,035,000	1,272,000	$ 1,035,000
Investments, Unfunded Commitments			1,000,000
Allocated Share-based Compensation Expense		$ 52,000	$ 31,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		17,000	42,000	1,302,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 2.34	$ 2.63
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized		$ 77,000		$ 77,000
The 2011 Non-employee Director Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		17,000	12,000
The 2015 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		0	30,000
Privately-held Technology Company [Member]
Cost Method Investments					$ 98,000
Investments, Unfunded Commitments	$ 1,000,000
General and Administrative Expense [Member]
Depreciation		$ 330,000	$ 248,000

X

- Definition

The amount of gain recognized as funds held in escrow from a prior investee company sale, were released.

+ References

No definition available.

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The amount of unfunded commitments for which the entity is obligated to pay in connection to an investment.

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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
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-Name Accounting Standards Codification
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-SubTopic 10
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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.

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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.

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This item represents the gain (loss) realized during the period from the sale of investments accounted for under the cost method of accounting.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Unrecognized cost of unvested share-based compensation awards.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale.

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No definition available.

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The difference between the carrying value and the sale price of an investment. A loss would be recognized when the sale price of the investment is less than the carrying value of the investment. This element refers to the Loss included in earnings and not to the cash proceeds of the sale.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period.

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Gross number of share options (or share units) granted during the period.

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No definition available.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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