Note 4 - Investments (Details) - Available-for-Sale Marketable Securities (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Note 4 - Investments (Details) - Available-for-Sale Marketable Securities [Line Items]
Fair value	$ 2,856,000	$ 1,606,000	[1]
Marketable Securities [Member]
Note 4 - Investments (Details) - Available-for-Sale Marketable Securities [Line Items]
Cost basis	328,000	255,000
Unrealized gains included in accumulated other comprehensive income	2,148,000	1,001,000
Realized gains previously recognized as warrants	380,000
Fair value	$ 2,856,000	$ 1,256,000

[1] The condensed consolidated balance sheet as of December 31, 2013 has been prepared using information from the audited consolidated balance sheet as of that date.