Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]
Beginning Balance at Dec. 31, 2013	$ 5,368		$ 285	$ 95,761	$ (90,678)
Beginning Balance, Shares at Dec. 31, 2013		0	28,481,496
Stock option exercises	$ 10			10
Stock option exercises, Shares	35,000		34,667
Stock-based compensation	$ 195			195
Net loss	(1,727)				(1,727)
Ending Balance at Dec. 31, 2014	3,846		$ 285	95,966	(92,405)
Ending Balance, Shares at Dec. 31, 2014		0	28,516,163
Stock option exercises	$ 26		$ 1	25
Stock option exercises, Shares	69,000		69,333
Stock-based compensation	$ 181			181
Net loss	(1,192)				(1,192)
Ending Balance at Dec. 31, 2015	$ 2,861		$ 286	$ 96,172	$ (93,597)
Ending Balance, Shares at Dec. 31, 2015		0	28,585,496