Note 2 - Investments in Non-public Companies (Details Textual) (USD $)	3 Months Ended		9 Months Ended		1 Months Ended	0 Months Ended		1 Months Ended
	Mar. 01, 2015	Feb. 23, 2014	Mar. 01, 2015	Feb. 23, 2014	Jun. 30, 2010	Feb. 15, 2011	Jul. 15, 2014	Oct. 29, 2014
Schedule of Investments [Line Items]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net			$ 793,000
Payments to Acquire Investments			18,000,000
Investment Income, Dividend	413,000	281,000	1,015,000	844,000
Apio [Member]
Schedule of Investments [Line Items]
Annual License Fee Percentage					3.00%
Aesthetic Sciences [Member] | Other Comprehensive Income (Loss) [Member]
Schedule of Investments [Line Items]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net			793,000
Windset [Member]
Schedule of Investments [Line Items]
Investment Ownership Percentage	26.90%		26.90%				26.90%
Preferred Stock, Dividend Rate, Percentage						7.50%
Change In Market Value Of Investment In Company	2,100,000	400,000	3,500,000	8,100,000
Windset [Member] | Apio [Member]
Schedule of Investments [Line Items]
Payments to Acquire Investments							11,000,000
Preferred Stock, Liquidation Preference, Value	20,100,000		20,100,000
Development Fee					100,000
Annual Minimum License Fees					150,000
License Agreement, Number of Products	2		2
Windset [Member] | Common Stock [Member] | Apio [Member]
Schedule of Investments [Line Items]
Investment In Non Public Company Shares						201	68
Payments to Acquire Investments						201
Windset [Member] | Junior Preferred Shares [Member] | Apio [Member]
Schedule of Investments [Line Items]
Investment In Non Public Company Shares							51,211
Preferred Stock, Liquidation Preference, Value	5,100,000		5,100,000
Windset [Member] | Senior A Preferred Stock [Member] | Apio [Member]
Schedule of Investments [Line Items]
Investment In Non Public Company Shares						150,000
Payments to Acquire Investments						15,000,000
Preferred Stock, Liquidation Preference, Value	15,000,000		15,000,000
Windset [Member] | Senior B Preferred Stock [Member] | Apio [Member]
Schedule of Investments [Line Items]
Investment In Non Public Company Shares								70,000
Payments to Acquire Investments								7,000,000
Preferred Stock, Dividend Rate, Percentage								7.50%
Windset [Member] | Senior B Preferred Stock [Member] | Apio [Member] | First Anniversary [Member]
Schedule of Investments [Line Items]
Investments, Value of Shares with Put Option								1,500,000
Windset [Member] | Senior B Preferred Stock [Member] | Apio [Member] | Second Anniversary [Member]
Schedule of Investments [Line Items]
Investments, Value of Shares with Put Option								2,750,000
Windset [Member] | Senior B Preferred Stock [Member] | Apio [Member] | Third Anniversary [Member]
Schedule of Investments [Line Items]
Investments, Value of Shares with Put Option								$ 2,750,000