Note 5 - Income Taxes (Detail) - Change in Unrecognized Tax Benefits (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Balance of unrecognized tax benefits	$ 266,000	$ 269,000
Reductions due to lapse of applicable statue of limitations	(117,000)	(38,000)
Additions based on tax positions of prior years	84,000	3,000
Reductions based on tax positions of prior years	(9,000)
Additions based on tax positions related to the current year		32,000
Balance of unrecognized tax benefits	$ 224,000	$ 266,000