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