Note 9 - Taxes on Income (Details) - Reconciliation Between Beginning and Ending Balances of Gross Unrecognized Tax Benefits (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2011
Reconciliation Between Beginning and Ending Balances of Gross Unrecognized Tax Benefits [Abstract]
Uncertain tax position liability at the beginning of the year	$ 1,446	$ 16	$ 16
Additions for tax positions for prior years		8
Additions resulting from merger transaction	23,715	1,422
Uncertain tax position liability at the end of the year	$ 25,161	$ 1,446	$ 16