Stockholders' Equity - Per Share Results (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2019
Earnings per share:
Net loss	$ (1,151)	$ (694)	$ (1,919)	$ (980)
Weighted average shares outstanding for computation of basic per share results	7,718,000	5,130,000	6,981,000	5,109,000
Adjusted weighted average shares for computation of diluted per share results	7,718,000	5,130,000	6,981,000	5,109,000
Incremental shares from assumed exercise of stock options excluded due to anti-dilutive effect	127,000	57,000	126,000		55,000