Note 10 - Stock-Based Compensation (Detail) - Allocation of Share-Based Compensation Expense (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Cost of Sales [Member]
Allocated Share-Based Compensation Expense	$ 1	$ 3	$ 5	$ 9
Selling Expense [Member]
Allocated Share-Based Compensation Expense	3	3	7	13
Engineering and Product Development Expense [Member]
Allocated Share-Based Compensation Expense	7	8	19	34
General and Administrative Expense [Member]
Allocated Share-Based Compensation Expense	21	18	62	63
Total [Member]
Allocated Share-Based Compensation Expense	$ 32	$ 32	$ 93	$ 119