Note 1 - Summary of Significant Accounting Policies (Details) - Financial Assets, Measured at Fair Value (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Note 1 - Summary of Significant Accounting Policies (Details) - Financial Assets, Measured at Fair Value [Line Items]
Cost	$ 5,119	$ 4,850
Unrealized Gain	2	4
Estimated Fair Value	5,121	4,854
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 1 - Summary of Significant Accounting Policies (Details) - Financial Assets, Measured at Fair Value [Line Items]
Cost	455	952
Unrealized Gain	1	3
Estimated Fair Value	456	955
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 1 - Summary of Significant Accounting Policies (Details) - Financial Assets, Measured at Fair Value [Line Items]
Cost	164	698
Unrealized Gain	1	1
Estimated Fair Value	165	699
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 1 - Summary of Significant Accounting Policies (Details) - Financial Assets, Measured at Fair Value [Line Items]
Cost	4,500	3,200
Unrealized Gain	0	0
Estimated Fair Value	$ 4,500	$ 3,200