Note 5 - Income Taxes (Details) - Deferred Tax Assets and Liabilities (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred Tax Assets and Liabilities [Abstract]
Inventories	$ 325	$ 283
Trade accounts receivable	6	6
Deferred revenue	325	130
Other accruals	605	432
Total current deferred tax assets	1,261	851
Depreciation	239	295
Other	377	397
Net operating loss carryforwards	16,323	15,872
Total noncurrent deferred tax assets	16,939	16,564
Valuation allowance for deferred tax assets	(18,200)	(17,415)
Deferred tax assets, net of valuation allowance	$ 0	$ 0