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15. BUSINESS SEGMENTS (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Shandong Morui Chemical Company Limited
Revenue from major customer	$ 2,378	$ 811
Percentage of total revenue (%)	22.60%	31.00%
Shandong Morui Chemical Company Limited | Bromine Segment
Revenue from major customer	$ 2,203	$ 0
Shandong Morui Chemical Company Limited | Crude Salt Segment
Revenue from major customer	175	656
Shandong Morui Chemical Company Limited | Chemical Products Segment
Revenue from major customer	0	155
Shouguang Weidong Chemical Company Limited
Revenue from major customer	$ 1,783	$ 543
Percentage of total revenue (%)	16.90%	21.00%
Shouguang Weidong Chemical Company Limited | Bromine Segment
Revenue from major customer	$ 1,629	$ 0
Shouguang Weidong Chemical Company Limited | Crude Salt Segment
Revenue from major customer	154	543
Shouguang Weidong Chemical Company Limited | Chemical Products Segment
Revenue from major customer	0	0
Shandong Brother Technology Limited, Kuerle Xingdong Trading Limited
Revenue from major customer	$ 1,732	$ 783
Percentage of total revenue (%)	16.40%	30.00%
Shandong Brother Technology Limited, Kuerle Xingdong Trading Limited | Bromine Segment
Revenue from major customer	$ 1,539	$ 0
Shandong Brother Technology Limited, Kuerle Xingdong Trading Limited | Crude Salt Segment
Revenue from major customer	192	783
Shandong Brother Technology Limited, Kuerle Xingdong Trading Limited | Chemical Products Segment
Revenue from major customer	0	$ 0
Dongying Bomeite Chemical Company Limited
Revenue from major customer	$ 1,098
Percentage of total revenue (%)	10.40%
Dongying Bomeite Chemical Company Limited | Bromine Segment
Revenue from major customer	$ 1,098
Dongying Bomeite Chemical Company Limited | Crude Salt Segment
Revenue from major customer	0
Dongying Bomeite Chemical Company Limited | Chemical Products Segment
Revenue from major customer	0
Shandong Shouguang Shenrunfa Ocean Chemical Company Limited
Revenue from major customer	$ 1,297
Percentage of total revenue (%)	12.30%
Shandong Shouguang Shenrunfa Ocean Chemical Company Limited | Bromine Segment
Revenue from major customer	$ 1,297
Shandong Shouguang Shenrunfa Ocean Chemical Company Limited | Crude Salt Segment
Revenue from major customer	0
Shandong Shouguang Shenrunfa Ocean Chemical Company Limited | Chemical Products Segment
Revenue from major customer	$ 0

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