8. Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net (loss) income (numerator for basic and diluted income per share)	$ 238	$ (247)	$ (1,318)	$ 650	$ 947	$ (443)	$ (1,327)	$ 1,153
Denominator:
Denominator for basic (loss) income per share weighted average shares	12,696,273			13,479,759			12,725,793	13,538,116
Effect of dilutive securities:
Options and restricted stock units	12,784			21,828			0	25,874
Denominator
Denominator for diluted (loss) income per share weighted average shares	12,709,057			13,501,587			12,725,793	13,563,990
Basic (loss) income per share	$ .02			$ .05			$ (.10)	$ .09
Diluted (loss) income per share	$ .02			$ .05			$ (.10)	$ .09