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R. SUBSEQUENT EVENTS - NARRATIVE (Details) - USD ($)
1 Months Ended 12 Months Ended
Mar. 02, 2017
Mar. 02, 2017
Feb. 27, 2017
Jan. 25, 2017
Oct. 17, 2016
Jun. 25, 2016
Jun. 24, 2016
Mar. 25, 2014
Mar. 19, 2014
Oct. 01, 2013
Aug. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Repayments of debt                       $ 5,855,000 $ 2,413,000 $ 8,076,000
Repayments of outstanding balance                       163,068,000 121,386,000 50,733,000
Common stock, value                       27,237,000 38,648,000 45,681,000
Common stock, shares               1,600,000 2,000,000 3,600,000        
Proceeds from common stock offering, net                       27,237,000 $ 38,648,000 $ 45,681,000
East West Bank and Comerica Bank [Member]                            
Revolving line of credit maximum borrowing capacity                       $ 10,000,000    
Term of revolving credit facility             5 years              
Interest rate description           LIBOR LIBOR              
Subsequent Event [Member] | East West Bank [Member]                            
Repayments of outstanding balance     $ 9,500,000                      
Revolving line of credit maximum borrowing capacity     10,000,000                      
ATM Offering [Member]                            
Common stock, value                     $ 38,600,000      
Common stock, shares         250,000,000           1,900,000      
Weighted average price per share                     $ 21.54      
Proceeds from common stock offering, net   $ 48,800,000                        
ATM Offering [Member] | Subsequent Event [Member]                            
Common stock, value $ 21,600,000                          
Common stock, shares 459,020 1,584,620                        
Weighted average price per share $ 47.98 $ 31.55                        
Second ATM Offering [Member]                            
Common stock, shares         50,000,000             1.10    
Weighted average price per share                       $ 24.85    
Proceeds from common stock offering, net                       27,200,000    
Purchase and Sale Contract and a Finance Lease Agreement | Subsequent Event [Member] | Chailease Finance Co. Ltd. [Member]                            
Termination agreement payment       $ 1,200,000                    
Term Loan [Member] | East West Bank [Member]                            
Revolving line of credit maximum borrowing capacity                       5,000,000    
Term Loan [Member] | East West Bank and Comerica Bank [Member]                            
Revolving line of credit maximum borrowing capacity                       10,000,000    
Term Loan [Member] | Subsequent Event [Member] | East West Bank and Comerica Bank [Member]                            
Repayments of outstanding balance     2,900,000                      
Revolving line of credit maximum borrowing capacity     $ 5,000,000                      
Letter of Credit [Member]                            
Revolving line of credit maximum borrowing capacity                       $ 10,000,000