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Supplementary Financial Information to Item 8. (Tables)
 12 Months Ended
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Data
2020Fourth
Quarter		Third
Quarter		Second
Quarter		First
Quarter
Net sales$3,746 $5,964 $3,335 $3,783 
Gross profit1,434 1,376 1,343 1,032 
Net income (loss)65 (1,165)(4,340)(541)
    
Net income (loss) per common share attributable to common stockholders - basic1:
$0.01 $(0.35)$(1.36)$(0.18)
Net income (loss) per common share attributable to common stockholders - diluted1:
$0.01 $(0.35)$(1.36)$(0.18)
Weighted average shares used in computing net income (loss) per common share2:
Basic3,491 3,308 3,192 3,086 
Diluted4,307 3,308 3,192 3,086 
 
2019Fourth
Quarter		Third
Quarter		Second
Quarter		First
Quarter
Net sales$3,531 $2,915 $3,082 $3,177 
Gross profit957 1,028 (109)98 
Net loss(1,308)(946)(2,254)(2,865)
    
Net loss per common share (basic and diluted)1
$(0.53)$(0.38)$(0.91)$(1.18)
Shares outstanding (basic and diluted)2
2,480 2,474 2,467 2,425