Note 5 - Warranty (Details) - Summary of Warranties (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Summary of Warranties [Abstract]
Beginning Balance	$ 1,071	$ 1,059	$ 1,202	$ 1,212
Add: Accruals for warranties issued during the period	591	811	1,047	1,712
Less: Settlements made during the period	(582)	(821)	(1,169)	(1,875)
Ending Balance	$ 1,080	$ 1,049	$ 1,080	$ 1,049