STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Total
Balance, beginning at Dec. 31, 2014		$ 285	$ 95,966	$ (92,405)	$ 3,846
Balance, beginning (shares) at Dec. 31, 2014		28,516,163
Stock option exercises		$ 1	25		$ 26
Stock option exercises (shares)		69,333			69,000
Stock-based compensation			181		$ 181
Net loss				(1,192)	(1,192)
Balance, ending at Dec. 31, 2015		$ 286	96,172	(93,597)	2,861
Balance, ending (shares) at Dec. 31, 2015		28,585,496
Sale of common stock		$ 26	962		988
Sale of common stock (shares)		2,600,000
Stock option exercises			18		$ 18
Stock option exercises (shares)		44,500			44,000
Stock-based compensation			207		$ 207
Net loss				(1,283)	(1,283)
Balance, ending at Dec. 31, 2016		$ 312	$ 97,359	$ (94,880)	$ 2,791
Balance, ending (shares) at Dec. 31, 2016		31,229,996