8. Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net (loss) income (numerator for basic and diluted income per share)	$ (247)	$ (1,318)	$ 947	$ (443)	$ (1,565)	$ 503
Denominator:
Denominator for basic (loss) income per share weighted average shares	12,720,112		13,532,958		12,740,798	13,567,778
Effect of dilutive securities:
Options and restricted stock units	0		14,436		0	27,808
Denominator
Denominator for diluted (loss) income per share weighted average shares	12,720,112		13,547,394		12,740,798	13,595,586
Basic (loss) income per share	$ (.02)		$ .07		$ (.12)	$ .04
Diluted (loss) income per share	$ (.02)		$ .07		$ (.12)	$ .04