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Note 7. Income Taxes (Detail) - Deferred Income Taxes (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Deferred tax assets:
Net operating loss carryforwards	$ 14,716	$ 14,491
Inventory	1,769	1,769
Other liabilities	3,155	3,055
Fixed assets	424	440
Other temporary differences	633	589
	20,697	20,344
Deferred tax valuation allowance	$ (20,697)	$ (20,344)

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory.

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.