Note 7 - Credit Agreement (Tables)

12 Months Ended

Dec. 31, 2015

Notes Tables

Schedule of Interest Expense and Commitment Fees on Debt Instrument [Table Text Block]

	December 31,
	2015		2014		2013
Interest expense	$	4,117	$	4,186	$	8,156
Commitment fees	$	1,513	$	1,465	$	887