Note 8 - Taxes on Income (Tax Benefits) Effective Rate Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Loss Carryforwards [Line Items]
Income taxes at U.S. federal statutory tax rate	$ (12,591)	$ 20,651	$ 24,803
State income taxes, net of federal income tax benefit	(3,073)	64	966
Domestic Production Activities Deduction	(81)	(1,548)	(1,440)
Meals and entertainment	863	1,034	962
Changes in taxes previously accrued	(1,932)	(3,098)	(2,422)
Foreign tax rate differences	(9,215)	(4,892)	(4,236)
Goodwill impairment	9,690	0	0
Recognition of uncertain tax positions	(96)	(89)	(800)
Total tax provision	(3,840)	12,154	18,663
Effective tax rate	10.70%	20.60%	26.30%
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Change in the balance of the valuation allowance for deferred tax assets allocated to income tax expense	7,785	1,447	3,714
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Change in the balance of the valuation allowance for deferred tax assets allocated to income tax expense	5,206	115	(10)
Acquisition-related Costs [Member]
Operating Loss Carryforwards [Line Items]
Transaction costs	0	0	509
Contingent Consideration Reversal [Member]
Operating Loss Carryforwards [Line Items]
Transaction costs	0	(1,461)	(2,869)
Other Matters [Member]
Operating Loss Carryforwards [Line Items]
Transaction costs	$ (396)	$ (69)	$ (514)