Note 3 - Investments (Details) - Investment in Common Stock Warrants (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Class of Warrant or Right [Line Items]
Fair value change in common stock warrants (1)	$ (350,000)
Ending Balance	1,606,000		293,000
Ending Balance [Member] | Warrant [Member]
Class of Warrant or Right [Line Items]
Ending Balance	350,000
Warrant [Member]
Class of Warrant or Right [Line Items]
Fair value change in common stock warrants (1)	350,000	[1]		[1]
Ending Balance	$ 350,000

[1] Amounts are recognized in other income on the accompanying consolidated statements of income