Note 9 - Financial Instruments and Fair Value (Tables)

12 Months Ended

Dec. 31, 2015

Notes Tables

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

At December 31, 2015

At December 31, 2014

Level 1 Inputs

Level 2 Inputs

Level 3 Inputs

Level 1 Inputs

Level 2 Inputs

Level 3 Inputs

Investment in auction rate securities

$

─

$

─

$

6,650

$

─

$

─

$

6,905

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

	C ost Basis Amount		Gross Unrealized Loss In Accumulated OCI		Fair Value
December 31, 201 5
Investment in auction rate securities	$	7,150	$	500	$	6,650
December 31, 201 4
Investment in auction rate securities	$	7,425	$	520	$	6,905

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

		Fair Value at
Derivative Liabilities Designated as Hedging Instruments	Balance Sheet Location	December 31, 2015		December 31, 2014
Interest Rate Swaps	Other Long-Term Liabilities	$	─	$	235

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

	Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) during the Year Ended				Location of Loss	Loss Reclassified from Accumulated OCI into Income (Effective Portion) during the Year Ended
	December 31, 201 5			December 31, 201 4	Reclassified into Income	December 31, 201 5			December 31, 201 4
Interest rate swaps	$	235	$	789	Interest Expense	$	(55	)	$	(196	)