Note 6 - Financial Instruments and Fair Value (Tables)

9 Months Ended

Sep. 30, 2017

Notes Tables

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

	At September 30, 2017						At December 31, 2016
	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Level 1 Inputs		Level 2 Inputs		Level 3 Inputs
Investment in auction rate securities	$	-	$	-	$	6,375	$	-	$	-	$	6,231

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

	C ost Basis Amount		Gross Unrealized Loss In Accumulated OCI		Fair Value
September 30, 2017
Investment in auction rate securities	$	6,375	˗		$	6,375
December 31, 2016
Investment in auction rate securities	$	6,700	$	469	$	6,231

Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block]

Description	Fair Value Measurements Using Significant Unobservable Inputs September 30, 201 7		Loss during the Three Months Ended September 30, 2017		Loss during the Three Months Ended September 30, 2016		Loss during the Nine Months Ended September 30, 2017		Loss during the Nine Months Ended September 30, 2016
Long-lived assets held for sale	$	10,319	$	−	$	−	$	−	$	(7,481	)