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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - A/R, Inventories, and Intangibles (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Accounts Receivable and Allowance for Doubtful Accounts          
Accounts Receivable Allowances $ 204   $ 204   $ 209
Inventories          
Raw Materials 14,397   14,397   13,870
Work in Process 307   307   3,112
Finished Goods 182   182   2,389
Reserves (917)   (917)   (844)
Total 13,969   13,969   18,527 [1]
Impairment Analysis          
Impairment charges recognized 0 $ 0 0 $ 0  
Finite-Lived Intangible Assets          
Gross Carrying Amount 2,233   2,233   2,230
Accumulated Amortization Amount 600   600   491
Net Book Value Amount 1,633   1,633   $ 1,739 [1]
Amortization expense 55 $ 56 109 $ 106  
Estimated future annual amortization expense          
Remainder of 2018 110   110    
2019 219   219    
2020 191   191    
2021 185   185    
2022 185   185    
Thereafter 726   726    
Total 1,616   $ 1,616    
Customer Relationships          
Finite-Lived Intangible Assets          
Remaining lives     9 years   9 years
Gross Carrying Amount 1,302   $ 1,302   $ 1,302
Accumulated Amortization Amount 434   434   361
Net Book Value Amount 868   $ 868   $ 941
Trade Names          
Finite-Lived Intangible Assets          
Remaining lives     3 years   20 years
Gross Carrying Amount 100   $ 100   $ 814
Accumulated Amortization Amount 44   44   102
Net Book Value Amount 56   $ 56   $ 712
Intellectual Property          
Finite-Lived Intangible Assets          
Remaining lives     20 years   3 years
Gross Carrying Amount 814   $ 814   $ 100
Accumulated Amortization Amount 122   122   28
Net Book Value Amount 692   $ 692   $ 72
Patents          
Finite-Lived Intangible Assets          
Remaining lives     7 years   7 years
Gross Carrying Amount 17   $ 17   $ 14
Net Book Value Amount $ 17   $ 17   $ 14
[1] The balance sheet at December 31, 2017 has been derived from the audited financial statements at that date