Note 4 - Inventories (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Inventory Disclosure [Abstract]
Inventory Write-down	$ 21,000	$ 45,000	$ 101,000	$ 65,000