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Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Quarterly results of operations
The following is a summary of the unaudited quarterly results of operations for the years ended December 31, 2019, 2018 and 2017.
  
 
1st Quarter
 
2nd Quarter
 
3rd Quarter
 
4th Quarter
 
Total Year
2019:
 
 
 
 
 
 
 
 
 
Product sales
$
71,451,000

 
$
75,440,000

 
$
67,511,000

 
$
54,585,000

 
$
268,987,000

Tooling sales
815,000

 
5,807,000

 
7,144,000

 
1,537,000

 
15,303,000

Net sales
72,266,000

 
81,247,000

 
74,655,000

 
56,122,000

 
284,290,000

Gross margin
3,149,000

 
8,491,000

 
6,484,000

 
3,382,000

 
21,506,000

Operating income (loss)
(4,017,000
)
 
1,267,000

 
(4,657,000
)
 
(4,121,000
)
 
(11,528,000
)
Net income (loss)
(3,845,000
)
 
209,000

 
(6,125,000
)
 
(5,462,000
)
 
(15,223,000
)
Net income (loss) per common share:
 
 
 
 
 
 
 
 
 
   Basic (1)
$
(0.49
)
 
$
0.03

 
$
(0.78
)
 
$
(0.69
)
 
$
(1.94
)
   Diluted (1)
$
(0.49
)
 
$
0.03

 
$
(0.78
)
 
$
(0.69
)
 
$
(1.94
)
 
 
 
 
 
 
 
 
 
 
2018:
 
 
 
 
 
 
 
 
 
Product sales
$
59,712,000

 
$
65,225,000

 
$
62,305,000

 
$
68,975,000

 
$
256,217,000

Tooling sales
3,334,000

 
3,376,000

 
2,371,000

 
4,187,000

 
13,268,000

Net sales
63,046,000

 
68,601,000

 
64,676,000

 
73,162,000

 
269,485,000

Gross margin
7,885,000

 
7,897,000

 
4,862,000

 
6,497,000

 
27,141,000

Operating income (loss)
1,125,000

 
1,418,000

 
(1,487,000
)
 
(4,156,000
)
 
(3,100,000
)
Net income (loss)
518,000

 
445,000

 
(1,803,000
)
 
(3,942,000
)
 
(4,782,000
)
Net income (loss) per common share:
 
 
 
 
 
 
 
 
 
   Basic (1)
$
0.07

 
$
0.06

 
$
(0.23
)
 
$
(0.51
)
 
$
(0.62
)
   Diluted (1)
$
0.07

 
$
0.06

 
$
(0.23
)
 
$
(0.51
)
 
$
(0.62
)
 
 
 
 
 
 
 
 
 
 
2017:
 
 
 
 
 
 
 
 
 
Product sales
$
36,336,000

 
$
36,794,000

 
$
37,593,000

 
$
37,900,000

 
$
148,623,000

Tooling sales
410,000

 
10,574,000

 
901,000

 
1,165,000

 
13,050,000

Net sales
36,746,000

 
47,368,000

 
38,494,000

 
39,065,000

 
161,673,000

Gross margin
6,479,000

 
7,341,000

 
5,752,000

 
5,059,000

 
24,631,000

Operating income
2,554,000

 
3,173,000

 
1,394,000

 
820,000

 
7,941,000

Net income
1,688,000

 
2,162,000

 
855,000

 
754,000

 
5,459,000

Net income per common share:
 
 
 
 
 
 
 
 
 
   Basic (1)
$
0.22

 
$
0.28

 
$
0.11

 
$
0.10

 
$
0.71

   Diluted (1)
$
0.22

 
$
0.28

 
$
0.11

 
$
0.10

 
$
0.70


(1) Sum of the quarters may not sum to total year due to rounding.