Note 8 - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Net operating losses	$ 14,800	$ 15,097
Capitalized inventory costs	6,717	4,250
Stock based compensation	6,460	5,467
Accruals not currently deductible	6,157	9,401
Unrealized foreign exchange	3,013	3,145
Foreign tax credits	2,558	862
Other	599	1,214
Total deferred tax assets	40,304	39,436
Valuation allowance	(16,780)	(15,353)
Total deferred tax assets, net of allowances	23,524	24,083
Deferred tax liabilities:
Accelerated depreciation and amortization	(38,034)	(40,308)
Tax on unremitted earnings	(7,181)	(6,680)
Other	(2,856)	(3,025)
Total deferred tax liabilities	48,071	50,013
Total net deferred tax liabilities	24,547	25,930
Non current deferred tax assets	1,821	1,857
Non current deferred tax liabilities	(26,368)	(27,787)
Net deferred tax liabilities	$ (24,547)	$ (25,930)