Note 6 - Deferred Service Contract Revenue (Tables)

3 Months Ended

Mar. 31, 2015

Deferred Revenue Disclosure [Abstract]

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

	Three Months Ended
	March 31,
	2015			2014
Beginning Balance	$	12,949		$	11,637
Add: Payments received		2,802			3,711
Less: Revenue recognized		(3,223	)		(3,056	)
Ending Balance	$	12,528		$	12,292