Note 1 - Basis of Consolidation and Presentation (Tables)

9 Months Ended

Sep. 30, 2015

Fair Value, Measurements, Recurring [Member]

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Level 1		Level 2		Level 3		Total
	(In thousands)
As of September 30, 2015
Money Market Funds	$	7,911	$	--	$	--	$	7,911
Commercial Paper		26,273		--		--		26,273
Total	$	34,184	$	--	$	--	$	34,184
As of December 31, 2014
Money Market Funds	$	9,442	$	--	$	--	$	9,442
Commercial Paper		29,686		--		--		29,686
Total	$	39,128	$	--	$	--	$	39,128

Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block]

	September 30, 2015		December 31, 2014
	(In thousands)
Total carrying amounts of long-term debt	$	6,328	$	8,068
Estimated fair value of long-term debt	$	6,318	$	7,997