Note 6 - Financial Instruments and Fair Value (Tables)

9 Months Ended

Sep. 30, 2016

Notes Tables

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

At September 30, 2016

At December 31, 2015

Level 1 Inputs

Level 2 Inputs

Level 3 Inputs

Level 1 Inputs

Level 2 Inputs

Level 3 Inputs

Investment in auction rate securities

$

−

$

−

$

6,231

$

−

$

−

$

6,650

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

	C ost Basis Amount		Gross Unrealized Loss In Accumulated OCI		Fair Value
September 30, 2016
Investment in auction rate securities	$	6,700	$	469	$	6,231
December 31, 2015
Investment in auction rate securities	$	7,150	$	500	$	6,650

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

Description	Fair Value Measurements Using Significant Unobservable Inputs September 30, 2016		Loss during the Three Months Ended September 30, 2016		Loss during the Nine Months Ended September 30, 2016
Long-lived assets held for sale	$	15,676	$	−	$	(7,481	)