Note 3 - Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block]

		June 30, 2013						December 31, 2012
	Fair Value Hierarchy	Cost		Unrealized Gain		Estimated Fair Value		Cost		Unrealized Gain		Estimated Fair Value
Asset Backed	Level 2	$	596	$	-	$	596	$	952	$	3	$	955
Corporate Bonds	Level 2		239		-		239		698		1		699
US Treasuries	Level 2		3,200		-		3,200		3,200		-		3,200
Total		$	4,035	$	-	$	4,035	$	4,850	$	4	$	4,854