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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)    
Revenue, net $ 1,991 $ 1,568
Cost of revenue 750 694
Gross profit 1,241 874
Operating expenses:    
Engineering, research and development 263 217
Selling, general and administrative 960 717
Total operating expenses 1,223 934
Income (loss) from operations 18 (60)
Other income (expense):    
Other income (expense), net 155 10
Income (loss) before income taxes 173 (50)
Income tax expense (benefit) 31 (7)
Net income (loss) 142 (43)
Net income (loss) applicable to common stockholders $ 42 $ (43)
Earnings (loss) per common share, basic $ 0.01 $ (0.01)
Earnings (loss) per common share, diluted $ 0.01 $ (0.01)
Weighted average common shares outstanding - basic 6,602 6,601
Weighted average common shares outstanding - diluted 6,602 6,601