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Consolidated Statements of Stockholders' Equity - USD ($)
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balances (in shares) at Dec. 31, 2014 11,329,732        
Balances at Dec. 31, 2014 $ 14,130,059 $ 29,090,058 $ (6,955,283) $ (622,441) $ 35,642,393
Exercise of stock options (in shares) 517,998       517,998
Exercise of stock options $ 1,784,112 (980,976)     $ 803,136
Shares deducted from exercise of stock options for payment of witholding taxes and exercise consideration (in shares) (99,675)       (99,675)
Shares deducted from exercise of stock options for payment of witholding taxes and exercise consideration   (1,306,981)     $ (1,306,981)
Repurchase and retirement of shares (note 10) (in shares) (1,062,456)       (1,062,456)
Repurchase and retirement of shares (note 10) $ (1,383,538) (22,232,748)     $ (23,616,286)
Income tax effect related to stock options exercised   3,431,017     3,431,017
Stock-based compensation (note 11)   526,025     526,025
Net income     11,373,730   11,373,730
Accretion of redeemable non-controlling interest in Ting Virginia, LLC. (note 3)     (36,598)   (36,598)
Other comprehensive income (loss)       (487,011) (487,011)
Balances (in shares) at Dec. 31, 2015 10,685,599        
Balances at Dec. 31, 2015 $ 14,530,633 8,526,395 4,381,849 (1,109,452) $ 26,329,425
Exercise of stock options (in shares) 109,963       109,963
Exercise of stock options $ 350,506 (204,116)     $ 146,390
Shares deducted from exercise of stock options for payment of witholding taxes and exercise consideration (in shares) (25,572)       (25,572)
Shares deducted from exercise of stock options for payment of witholding taxes and exercise consideration   (363,285)     $ (363,285)
Repurchase and retirement of shares (note 10) (in shares) (308,416)       (308,416)
Repurchase and retirement of shares (note 10) $ (420,639) (6,759,618)     $ (7,180,257)
Income tax effect related to stock options exercised   859,111     859,111
Stock-based compensation (note 11)   799,434     799,434
Net income     16,067,154   16,067,154
Accretion of redeemable non-controlling interest in Ting Virginia, LLC. (note 3)     (49,492)   (49,492)
Other comprehensive income (loss)       1,208,606 1,208,606
Balances (in shares) at Dec. 31, 2016 10,461,574        
Balances at Dec. 31, 2016 $ 14,460,500 2,857,921 20,399,511 99,154 $ 37,817,086
Exercise of stock options (in shares) 172,759       172,759
Exercise of stock options $ 907,661 (686,074)     $ 221,587
Shares deducted from exercise of stock options for payment of witholding taxes and exercise consideration (in shares) (50,454)       (50,454)
Shares deducted from exercise of stock options for payment of witholding taxes and exercise consideration   (1,461,651)     $ (1,461,651)
Repurchase and retirement of shares (note 10) (in shares)        
Repurchase and retirement of shares (note 10)        
Stock-based compensation (note 11)   1,456,572     1,456,572
Net income     22,326,594   22,326,594
Accretion of redeemable non-controlling interest in Ting Virginia, LLC. (note 3)     (50,300)   (50,300)
Other comprehensive income (loss)       (99,154) (99,154)
Balances (in shares) at Dec. 31, 2017 10,583,879        
Balances at Dec. 31, 2017 $ 15,368,161 $ 2,166,768 $ 42,675,805 $ 60,210,734