Note 1 - Basis of Consolidation and Presentation (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2016
Money Market Funds	$	9,353	$	--	$	--	$	9,353
Commercial Paper		--		14,412		--		14,412
Total	$	9,353	$	14,412	$	--	$	23,765
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, Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block]

	March 31, 2016		December 31, 2015
	(In thousands)
Total carrying amounts of long-term debt	$	5,146	$	5,739
Estimated fair value of long-term debt	$	5,142	$	5,708