v3.19.1

QUARTERLY FINANCIAL DATA (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Lower of cost or NRV | $ 930 | $ 0 | $ 76 | $ 705 | $ 1,571 | $ 666 | $ 317 | $ 3,825 | $ 1,711 |  | $ 6,379 |  | $ 20,374 |
Costs associated with abnormal production and other |  |  |  |  |  |  |  |  |  |  |  |  | 1,707 |
Gross Margin (Deficit) | 14,826 | 8,959 | 7,286 | 7,200 | 3,628 | 6,062 | 4,803 | (2,605) | 38,271 |  | 11,888 |  | (26,797) |
Net Income (Loss) | $ 7,634 | $ 3,350 | $ (958) | $ 1,757 | $ (1,636) | $ (1,445) | $ (5,819) | $ (13,667) | 11,783 |  | (22,567) |  | (64,183) |
Basic and Diluted Earnings(Loss) Per Share | $ 0.06 | $ 0.03 | $ (0.01) | $ 0.01 | $ (0.01) | $ (0.01) | $ (0.05) | $ (0.17) |  |  |  |  |  |
Mineral [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales | $ 54,364 | $ 41,410 | $ 55,176 | $ 57,320 | $ 42,582 | $ 36,484 | $ 47,347 | $ 51,502 | 208,270 | [1] | 177,915 | [1] | 212,097 | [1]
Cost of Goods Sold | $ 26,504 | $ 23,370 | $ 35,426 | $ 36,655 | $ 26,481 | $ 21,414 | $ 31,735 | $ 38,332 | $ 121,955 |  | $ 117,962 |  | $ 169,745 |
[1] | Segment sales include the sales of byproducts generated during the production of potash and Trio®. Prior to the adoption of ASC 606, sales of byproducts were accounted for as a credit to cost of goods sold for potash and Trio®.

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