Note 6 - Income Taxes (Detail) - Deferred Tax Assets and Liabilities (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Inventories	$ 283	$ 264
Accounts receivable	6	6
Deferred revenue	130	57
Other accruals	432	287
Total current deferred tax assets	851	614
Depreciation	295	229
Other	397	251
Net operating loss carryforwards	15,872	14,862
Total noncurrent deferred tax assets	16,564	15,342
Valuation allowance for deferred tax assets	(17,415)	(15,956)
Deferred tax assets, net of valuation allowance	$ 0	$ 0