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INCOME TAXES (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Effective income tax rate (as a percent) 38.00% 10.00% 36.00% 10.00%   8.40%
Reconciliation of federal income taxes and reported income taxes            
Statutory federal tax provision (benefit) $ (57,000) $ 129,000 $ (327,000) $ 259,000    
State income taxes (benefits) (6,000) 14,000 (32,000) 33,000    
Income tax credits (14,000) (19,000) (39,000) (33,000)    
Change in uncertain tax positions (4,000) 1,000 (4,000) (99,000)    
Return to provision true-up 5,000 (84,000) 5,000 (84,000)    
Other   (3,000)   (3,000)    
Income tax expense (benefit) (76,000) 38,000 (397,000) 73,000    
Unrecognized tax benefits            
Net uncertain tax benefit positions that would increase (reduce) effective income tax rate, if recognized $ 51,750   $ 51,750     $ 56,000
Minnesota Tax Authority            
Unrecognized tax benefits            
Research and development credits   $ 100,000   $ 100,000    
Forecast            
Effective income tax rate (as a percent)         36.00%