Note 10 - Income Taxes (Details) - Effective Tax Rate Analysis and Reconciliation of Expected Statutory Rate (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Effective Tax Rate Analysis and Reconciliation of Expected Statutory Rate [Abstract]
Expected income tax provision at U.S. statutory rate									$ 1,669	$ 1,363
Increase (decrease) in tax from:
Changes in valuation allowance									(187)	(286)
Current year tax credits (foreign and research)									(179)	(417)
Foreign income tax rate differences									(63)	(80)
Deemed dividend from foreign subsidiaries									208	135
NOL carryforwards utilized									93	200
Domestic tax expense, net of Federal benefit									52	127
Nondeductible expenses									7	10
Other									(130)	(121)
Income tax expense	$ 217	$ 431	$ 697	$ 125	$ 345	$ 24	$ 484	$ 78	$ 1,470	$ 931