Note 8 - Taxes on Income (Detail) - Unrecognized Tax Benefits (USD $)	24 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Excluding Interest and Penalties [Member]	Dec. 31, 2011 Excluding Interest and Penalties [Member]
Balance			$ 582,000	$ 586,000
Additions based on tax positions related to the current year			68,000	79,000
Reduction for tax positions of prior years			(10,000)
Reductions due to lapse of statute of limitations	(29,000)	(44,000)	(75,000)	(83,000)
Balance	$ 736,000	$ 735,000	$ 565,000	$ 582,000