Note 9. Share-Based Payments (Detail) - Stock-Based Compensation Expense (USD $)	3 Months Ended					9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Jun. 30, 2011	Sep. 30, 2012		Sep. 30, 2011
Compensation expense before income taxes	$ 23,000				$ 30,000	$ 3,000
Benefit for income taxes (1)			1,000			2,000		4,000
Net compensation expense	(9,000)		253,000			394,000		753,000
Selling, General and Administrative Expenses [Member]
Compensation expense before income taxes	(64,000)		184,000			252,000		550,000
Research and Development Expense [Member]
Compensation expense before income taxes	55,000		69,000			142,000		203,000
Stock-based Compensation Expense [Member]
Compensation expense before income taxes	(9,000)		253,000			394,000		753,000
Benefit for income taxes [Member]
Benefit for income taxes (1)		[1]		[1]			[1]		[1]

[1] The stock-based compensation expense has not been tax-effected due to the recording of a full valuation allowance against net deferred tax assets.