Note 8 - Taxes on Income (Tax Benefits) Effective Rate Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Loss Carryforwards [Line Items]
Income taxes at U.S. federal statutory tax rate	$ 20,651	$ 24,803	$ 11,539
Change in the balance of the valuation allowance for deferred tax assets allocated to income tax expense	1,447	3,714	477
State income taxes, net of federal income tax benefit	179	956	(547)
Domestic Production Activities Deduction	(1,548)	(1,440)	(52)
Meals and entertainment	1,034	962	570
Changes in taxes previously accrued	(3,098)	(2,422)	263
Foreign tax rate differences	(4,892)	(4,236)	(3,412)
Recognition of uncertain tax positions	(89)	(800)	(214)
Total tax provision	12,154	18,663	8,184
Effective tax rate	20.60%	26.30%	24.80%
Acquisition-related Costs [Member]
Operating Loss Carryforwards [Line Items]
Transaction costs	0	509	574
Contingent Consideration Reversal [Member]
Operating Loss Carryforwards [Line Items]
Transaction costs	(1,461)	(2,869)	0
Other Matters [Member]
Operating Loss Carryforwards [Line Items]
Transaction costs	$ (69)	$ (514)	$ (1,014)