Net Income Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net Income Per Share, Basic and Diluted
Basic EPS (in shares)	6,578,808	6,492,501	6,553,522	6,410,588
Common stock warrants (in shares)	70,291	155,490	69,682	190,144
Common stock options (in shares)	1,389,414	1,460,062	1,423,556	1,521,264
Diluted EPS (in shares)	8,038,513	8,108,053	8,046,759	8,121,996
Net Income - Basic EPS	$ 4,866	$ 7,779	$ 8,614	$ 12,251
Net Income - Common stock warrants	0	0	0	0
Net Income - Common stock options	0	0	0	0
Net Income - Diluted EPS	$ 4,866	$ 7,779	$ 8,614	$ 12,251
Basic EPS (in dollars per share)	$ 0.74	$ 1.20	$ 1.31	$ 1.91
Diluted EPS (in dollars per share)	$ 0.61	$ 0.96	$ 1.07	$ 1.51