Note 10 - Credit Agreement (Tables)

6 Months Ended

Jun. 30, 2018

Notes Tables

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Interest expense	$	2,627	$	1,469	$	4,697	$	2,843
Commitment fees		239		333		477		711