Annual report pursuant to Section 13 and 15(d)

QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) (Details)

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QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
 3 Months Ended 12 Months Ended
Jul. 31, 2016
Dec. 31, 2017
Sep. 30, 2017
 [2]
Jun. 30, 2017
 [3]
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly results of operations [Abstract]                          
Revenues   $ 65,978 [1] $ 61,508 $ 62,115 $ 55,542 $ 54,203 $ 57,142 $ 48,854 $ 52,200   $ 245,143 $ 212,399 $ 241,976
Gross profit   9,966 [1] 9,870 11,107 10,618 7,652 8,905 11,574 11,771   41,561 39,902 57,009
Net Income   $ 13,972 [1] $ 1,718 $ 832 $ 1,487 $ (847) $ 2,799 $ 10,252 $ 7,224   $ 18,009 $ 19,428 $ 18,598
Basic EPS (in dollars per share)   $ 0.58 [1],[4] $ 0.07 [4] $ 0.03 [4] $ 0.06 [4] $ (0.03) [4] $ 0.12 [4] $ 0.42 [4] $ 0.30 [4]   $ 0.74 [4] $ 0.80 [4] $ 0.76
Diluted EPS (in dollars per share)   $ 0.56 [1],[4] $ 0.07 [4] $ 0.03 [4] $ 0.06 [4] $ (0.03) [4] $ 0.11 [4] $ 0.41 [4] $ 0.29 [4]   $ 0.72 [4] $ 0.78 [4] $ 0.74
Bargain purchase gain from acquisition               $ 11,500     $ 0 $ 11,549 $ 0
Shares issued by AMAK (in shares) 4                        
Gain from equity issuance by AMAK             $ 3,200       $ 0 $ 3,168 $ 0
Income Tax Disclosure [Line Items]                          
Federal statutory rate                     35.00% 35.00% 35.00%
Change in tax rate, income tax benefit   $ 10,300                      
Plan [Member]                          
Income Tax Disclosure [Line Items]                          
Federal statutory rate                   21.00%      
[1] As discussed in Note 17 the TCJA changed the federal corporate income tax rates from 35% to 21% resulting in a benefit from deferred taxes of approximately $10.3 million.
[2] As discussed in Note 11, in July 2016 AMAK issued four million shares. As a result of the equity issuance, our share of the net assets of AMAK increased approximately $3.2 million which we recognized as a gain.
[3] On May 2, 2016, we purchased B Plant. As discussed in Note 3, we recorded a bargain purchase gain of approximately $11.5 million on the transaction.
[4] Basic and diluted earnings per share are computed independently for each of the quarters presented based on the weighted average number of common shares outstanding during that period. Therefore, the sum of quarterly basic and diluted per share information may not equal annual basic and diluted earnings per share.