Note 2 - Significant Accounting Policies (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended		24 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars)	$ 274		$ 274
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition			2 years 102 days
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares)	503,500	403,500
Minimum [Member]
Stock Rotation Period	15 years
Warranty Period	1 year
Maximum [Member]
Stock Rotation Period	18 years
Warranty Period	2 years
Inventory Write Off (Member)
Cost of Goods Sold (in Dollars)	$ 45	36