15. BUSINESS SEGMENTS (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Shandong Morui Chemical Company Limited
Revenue from major customer	$ 5,963	$ 2,378
Percentage of total revenue (%)	21.20%	22.60%
Shandong Morui Chemical Company Limited | Bromine Segment
Revenue from major customer	$ 4,901	$ 2,203
Shandong Morui Chemical Company Limited | Crude Salt Segment
Revenue from major customer	1,062	175
Shandong Morui Chemical Company Limited | Chemical Products Segment
Revenue from major customer	0	0
Shouguang Weidong Chemical Company Limited
Revenue from major customer	$ 4,271	$ 1,783
Percentage of total revenue (%)	15.20%	16.90%
Shouguang Weidong Chemical Company Limited | Bromine Segment
Revenue from major customer	$ 3,188	$ 1,629
Shouguang Weidong Chemical Company Limited | Crude Salt Segment
Revenue from major customer	1,083	154
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	$ 4,559	$ 1,732
Percentage of total revenue (%)	16.20%	16.40%
Shandong Brother Technology Limited, Kuerle Xingdong Trading Limited | Bromine Segment
Revenue from major customer	$ 3,683	$ 1,539
Shandong Brother Technology Limited, Kuerle Xingdong Trading Limited | Crude Salt Segment
Revenue from major customer	876	192
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	$ 2,970	$ 1,098
Percentage of total revenue (%)	10.50%	10.40%
Dongying Bomeite Chemical Company Limited | Bromine Segment
Revenue from major customer	$ 2,970	$ 1,098
Dongying Bomeite Chemical Company Limited | Crude Salt Segment
Revenue from major customer	0	0
Dongying Bomeite Chemical Company Limited | Chemical Products Segment
Revenue from major customer	0	0
Shandong Shouguang Shenrunfa Ocean Chemical Company Limited
Revenue from major customer	$ 3,320	$ 1,297
Percentage of total revenue (%)	11.80%	12.30%
Shandong Shouguang Shenrunfa Ocean Chemical Company Limited | Bromine Segment
Revenue from major customer	$ 3,320	$ 1,297
Shandong Shouguang Shenrunfa Ocean Chemical Company Limited | Crude Salt Segment
Revenue from major customer	0	0
Shandong Shouguang Shenrunfa Ocean Chemical Company Limited | Chemical Products Segment
Revenue from major customer	$ 0	$ 0