Note 1 - Basis of Consolidation and Presentation (Tables)

9 Months Ended

Sep. 30, 2016

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, 2016
Money Market Funds	$	10,536	$	--	$	--	$	10,536
Commercial Paper		--		18,247		--		18,247
Total	$	10,536	$	18,247	$	--	$	28,783
As of December 31, 2015
Money Market Funds	$	8,954	$	--	$	--	$	8,954
Commercial Paper		--		30,872		--		30,872
Total	$	8,954	$	30,872	$	--	$	39,826

Fair Value, by Balance Sheet Grouping [Table Text Block]

	September 30, 2016		December 31, 2015
	(In thousands)
Total carrying amounts of long-term debt	$	3,945	$	5,739
Estimated fair value of long-term debt	$	3,944	$	5,708