| Segment Information | 
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   | 
Three Months Ended  | 
   | 
Nine Months Ended  | 
 
   | 
Sep 30, 2016  | 
   | 
Oct 3, 2015  | 
   | 
Sep 30, 2016  | 
   | 
Oct 3, 2015  | 
 
Net sales  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Metals Segment  | 
$  | 
22,291,000  | 
 
  | 
   | 
$  | 
23,084,000  | 
 
  | 
   | 
$  | 
68,331,000  | 
 
  | 
   | 
$  | 
92,488,000  | 
 
  | 
 
Specialty Chemicals Segment  | 
12,006,000  | 
 
  | 
   | 
14,999,000  | 
 
  | 
   | 
37,185,000  | 
 
  | 
   | 
47,407,000  | 
 
  | 
 
   | 
$  | 
34,297,000  | 
 
  | 
   | 
$  | 
38,083,000  | 
 
  | 
   | 
$  | 
105,516,000  | 
 
  | 
   | 
$  | 
139,895,000  | 
 
  | 
 
Operating (loss) income  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Metals Segment  | 
$  | 
(3,240,000  | 
)  | 
   | 
$  | 
(548,000  | 
)  | 
   | 
$  | 
(5,661,000  | 
)  | 
   | 
$  | 
5,400,000  | 
 
  | 
 
Specialty Chemicals Segment  | 
1,188,000  | 
 
  | 
   | 
1,598,000  | 
 
  | 
   | 
3,720,000  | 
 
  | 
   | 
4,624,000  | 
 
  | 
 
   | 
(2,052,000  | 
)  | 
   | 
1,050,000  | 
 
  | 
   | 
(1,941,000  | 
)  | 
   | 
10,024,000  | 
 
  | 
 
Less unallocated corporate expenses  | 
1,713,000  | 
 
  | 
   | 
1,157,000  | 
 
  | 
   | 
4,335,000  | 
 
  | 
   | 
3,385,000  | 
 
  | 
 
Acquisition related costs  | 
1,000  | 
 
  | 
   | 
9,000  | 
 
  | 
   | 
76,000  | 
 
  | 
   | 
454,000  | 
 
  | 
 
Operating (loss) income  | 
(3,766,000  | 
)  | 
   | 
(116,000  | 
)  | 
   | 
(6,352,000  | 
)  | 
   | 
6,185,000  | 
 
  | 
 
Interest expense  | 
273,000  | 
 
  | 
   | 
342,000  | 
 
  | 
   | 
822,000  | 
 
  | 
   | 
1,040,000  | 
 
  | 
 
Change in fair value of interest rate swap  | 
(115,000  | 
)  | 
   | 
247,000  | 
 
  | 
   | 
277,000  | 
 
  | 
   | 
233,000  | 
 
  | 
 
Specialty and Palmer earn-out adjustments  | 
—  | 
 
  | 
   | 
(2,414,000  | 
)  | 
   | 
—  | 
 
  | 
   | 
(4,897,000  | 
)  | 
 
Other income  | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
(137,000  | 
)  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
     (Loss) income from operations before income taxes  | 
$  | 
(3,924,000  | 
)  | 
   | 
$  | 
1,709,000  | 
 
  | 
   | 
$  | 
(7,451,000  | 
)  | 
   | 
$  | 
9,946,000  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
   | 
As of  | 
   | 
   | 
 
   | 
Sep 30, 2016  | 
   | 
Dec 31, 2015  | 
   | 
   | 
   | 
   | 
 
Identifiable assets  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Metals Segment  | 
$  | 
98,873,000  | 
 
  | 
   | 
$  | 
112,749,000  | 
 
  | 
   | 
   | 
   | 
   | 
 
Specialty Chemicals Segment  | 
24,352,000  | 
 
  | 
   | 
33,391,000  | 
 
  | 
   | 
   | 
   | 
   | 
 
Corporate  | 
3,353,000  | 
 
  | 
   | 
2,903,000  | 
 
  | 
   | 
   | 
   | 
   | 
 
   | 
$  | 
126,578,000  | 
 
  | 
   | 
$  | 
149,043,000  | 
 
  | 
   | 
   | 
   | 
   | 
 
  
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