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SEGMENT REPORTING - Segment Reporting Information by Segment (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
segment
Dec. 31, 2016
USD ($)
MW
Dec. 31, 2016
USD ($)
item
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
SEGMENT REPORTING                          
Number of reportable segments                 2   2    
Revenues from external customers                       $ 180,840 $ 199,156
Revenues from external customers $ 48,151 $ 42,552 $ 43,380 $ 46,757 $ 37,573 $ 49,791 $ 62,563 $ 49,229       180,840 199,156
Operating profit (loss) 592 $ 1,360 $ 181 $ (224) (11,025) $ (2,135) $ 3,616 $ (2,364)       1,909 (11,908)
Depreciation and amortization                       6,914 9,179
Capital expenditures                       6,624 2,789
Assets held for sale 808       4,403       $ 808 $ 808 $ 808 808 4,403
Assets, Noncurrent         4,403               4,403
Total Assets 117,662       109,907       117,662 117,662 $ 117,662 117,662 109,907
Towers                          
SEGMENT REPORTING                          
Number of facilities | item                     2    
Revenues from external customers                       160,210 170,540
Intersegment revenues                         379
Revenues from external customers                       160,210 170,919
Operating profit (loss)                       12,788 4,702
Depreciation and amortization                       4,166 3,954
Capital expenditures                       6,161 2,096
Assets, Noncurrent         554               554
Total Assets 45,367       38,622       45,367 $ 45,367 $ 45,367 45,367 38,622
Towers | Minimum                          
SEGMENT REPORTING                          
Power generating capacity of turbines that towers produced annually can support (in megawatts) | MW                   1,000      
Towers | Maximum                          
SEGMENT REPORTING                          
Annual tower production capacity (in towers) | item                     500    
Gearing                          
SEGMENT REPORTING                          
Revenues from external customers                       20,630 28,616
Intersegment revenues                       18 972
Revenues from external customers                       20,648 29,588
Operating profit (loss)                       (3,244) (8,235)
Depreciation and amortization                       2,545 5,031
Capital expenditures                       386 583
Assets held for sale 353               353 $ 353 $ 353 353  
Assets, Noncurrent         506               506
Total Assets 30,415       39,735       30,415 30,415 30,415 30,415 39,735
Corporate                          
SEGMENT REPORTING                          
Operating profit (loss)                       (7,636) (8,378)
Depreciation and amortization                       203 194
Capital expenditures                       77 110
Assets held for sale 455               455 455 455 455  
Assets, Noncurrent         3,343               3,343
Total Assets 244,639       256,238       244,639 244,639 244,639 244,639 256,238
Eliminations                          
SEGMENT REPORTING                          
Intersegment revenues                       (18) (1,351)
Revenues from external customers                       (18) (1,351)
Operating profit (loss)                       1 3
Total Assets $ (202,759)       $ (224,688)       $ (202,759) $ (202,759) $ (202,759) $ (202,759) $ (224,688)