Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net revenues	$ 14,443	$ 14,632	$ 38,948	$ 47,046
Cost of revenues	7,993	7,427	21,564	24,286
Gross margin	6,450	7,205	17,384	22,760
Operating expenses:
Selling expense	1,747	2,044	5,560	6,505
Engineering and product development expense	1,316	1,261	3,825	3,753
General and administrative expense	2,960	3,094	8,732	10,549
Total operating expenses	6,023	6,399	18,117	20,807
Operating income (loss)	427	806	(733)	1,953
Other income (loss)	6	(12)	(44)	3
Earnings (loss) before income tax expense (benefit)	433	794	(777)	1,956
Income tax expense (benefit)	(25)	147	(262)	358
Net earnings (loss)	$ 458	$ 647	$ (515)	$ 1,598
Net earnings (loss) per common share - basic (in dollars per share)	$ 0.04	$ 0.06	$ (0.05)	$ 0.15
Weighted average common shares outstanding - basic (in shares)	10,269,995	10,421,383	10,247,779	10,405,892
Net earnings (loss) per common share - diluted (in dollars per share)	$ 0.04	$ 0.06	$ (0.05)	$ 0.15
Weighted average common shares and common share equivalents outstanding - diluted (in shares)	10,287,562	10,429,536	10,247,779	10,423,121