Note 4 - Investments (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Note 4 - Investments (Details) [Line Items]
Available-for-sale Securities, Current	$ 2,426,000			$ 2,426,000		$ 1,606,000	[1]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax				245,000
Marketable Securities, Unrealized Gain (Loss)	(430,000)		463,000	717,000	574,000
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	152,000		174,000	234,000	216,000
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(278,000)		289,000	483,000	358,000
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	2,426,000			2,426,000		1,256,000
Warrant [Member]
Note 4 - Investments (Details) [Line Items]
Available-for-sale Securities, Current						350,000
Warrant [Member]
Note 4 - Investments (Details) [Line Items]
Marketable Securities, Realized Gain (Loss)				$ 379,000

[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.