Note 1 - Organization and Summary of Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended		154 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015
General and Administrative Expense [Member]
Depreciation	$ 217,000	$ 155,000
The 2011 Non-Employee Directors Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	12,000	16,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 2.10	$ 1.06
Tangible Asset Impairment Charges	$ 0	$ 0
Marketable Securities	396,000	463,000	$ 396,000
Marketable Securities, Unrealized Gain (Loss)	68,000	20,000
Gain on Sale of Investments	1,247,000
Cost-method Investments, Realized Gain (Loss), Excluding Other than Temporary Impairments	2,034,000	145,000
Equity Method Investment, Other than Temporary Impairment	792,000
Equity Method Investments	100,000		100,000
Cost-method Investments, Other than Temporary Impairment		17,000
Cost Method Investments	1,015,000	1,605,000	$ 1,015,000
Allocated Share-based Compensation Expense	$ 19,000	$ 49,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	12,000	16,000	1,243,500
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 23,000		$ 23,000