Note 7 - Unrecognized Tax Benefits (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Excluding Interest and Penalties [Member]
Balance at January 1,	$ 462,000	$ 497,000
Additions based on tax positions related to the current year	58,000	59,000
(Reductions) additions for tax positions of prior years	2,000	(7,000)
Reductions due to lapse of statute of limitations	(123,000)	(87,000)
Balance at December 31,	399,000	462,000
Reductions due to lapse of statute of limitations	$ (44,000)	$ (38,000)