Note 4 - Investments (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Note 4 - Investments (Details) [Line Items]
Available-for-sale Securities, Current	$ 2,856,000		$ 2,856,000		$ 1,606,000	[1]
Marketable Securities, Realized Gain (Loss)	218,000		379,000
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	141,000		245,000
Marketable Securities, Unrealized Gain (Loss)	655,000	35,000	1,147,000	110,000
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax		13,000	387,000	41,000	233,000
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	563,000	22,000	1,005,000	69,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)					167,500
Derivative, Gain on Derivative					30,000
Marketable Securities [Member]
Note 4 - Investments (Details) [Line Items]
Available-for-sale Securities, Current	2,856,000		2,856,000		1,256,000
Warrant [Member]
Note 4 - Investments (Details) [Line Items]
Available-for-sale Securities, Current					$ 350,000

[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.