Note 6 - Financial Instruments and Fair Value (Tables)

3 Months Ended

Mar. 31, 2017

Notes Tables

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

	At March 31, 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	$	-	$	-	$	6,231	$	-	$	-	$	6,231

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

	C ost Basis Amount		Gross Unrealized Loss In Accumulated OCI		Fair Value
March 31, 2017
Investment in auction rate securities	$	6,700	$	469	$	6,231
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 March 31, 2017		Loss D uring the Quarter Ended March 31, 2017
Long-lived assets held for sale	$	12,932	$	−