Annual report pursuant to Section 13 and 15(d)

QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) - Schedule of Quarterly Financial Information (Details)

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QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) - Schedule of Quarterly Financial Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Revenues $ 23,632,000 $ 23,844,000 $ 21,875,000 $ 27,249,000 $ 28,996,000 $ 25,931,000 $ 21,449,000 $ 22,347,000      
Gross profit 7,559,000 7,327,000 6,600,000 7,712,000 7,921,000 7,257,000 5,982,000 6,480,000      
Net income (loss) $ 451,000 $ 740,000 $ 83,000 $ 596,000 $ 7,610,000 $ 787,000 $ (594,000) $ (768,000) $ 1,869,955 $ 7,034,881 $ (2,848,256)
Basic net income (loss) per share (in dollars per share) $ 0.02 $ 0.03 $ 0.00 $ 0.02 $ 0.29 $ 0.03 $ (0.02) $ (0.03) $ 0.07 $ 0.27 $ (0.11)
Diluted net income (loss) per share (in dollars per share) $ 0.02 $ 0.03 $ 0.00 $ 0.02 $ 0.29 $ 0.03 $ (0.02) $ (0.03) $ 0.07 $ 0.27 $ (0.11)
Previously Reported                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Revenues         $ 28,996,000 $ 25,931,000 $ 21,449,000 $ 22,347,000      
Gross profit         7,921,000 7,257,000 5,982,000 6,480,000      
Net income (loss)         $ 4,409,000 $ 787,000 $ (594,000) $ (768,000)   $ 3,834,136  
Basic net income (loss) per share (in dollars per share)         $ 0.17 $ 0.03 $ (0.02) $ (0.03)   $ 0.15  
Diluted net income (loss) per share (in dollars per share)         $ 0.17 $ 0.03 $ (0.02) $ (0.03)   $ 0.15