Note 4 - Inventories (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Inventory Disclosure [Abstract]
Inventory Write-down	$ 64,000	$ (5,000)	$ 80,000	$ 20,000