Note 6 - Deferred Service Contract Revenue (Tables)

6 Months Ended

Jun. 30, 2014

Deferred Revenue Disclosure [Abstract]

Deferred Revenue, by Arrangement, Disclosure [Table Text Block]

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2014			2013			2014			2013
Beginning Balance	$	12,292		$	9,151		$	11,637		$	8,539
Add: Payments received		3,856			3,538			7,567			7,140
Less: Revenue recognized		(3,147	)		(2,974	)		(6,203	)		(5,964	)
Ending Balance	$	13,001		$	9,715		$	13,001		$	9,715