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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Cumulative Effect, Period of Adoption, Adjustment [Member]
Common Stock [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Additional Paid-in Capital [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
AOCI Attributable to Parent [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Common Stock [Member]
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Additional Paid-in Capital [Member]
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
AOCI Attributable to Parent [Member]
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Previously Reported [Member]
Common Stock [Member]
Previously Reported [Member]
Additional Paid-in Capital [Member]
 [1]
Previously Reported [Member]
Retained Earnings [Member]
 [1]
Previously Reported [Member]
AOCI Attributable to Parent [Member]
 [1]
Previously Reported [Member]
 [1]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balances (in shares) at Dec. 31, 2017           10,583,879                   10,583,879 [1]        
Balances at Dec. 31, 2017 $ 0 $ 0 $ 1,063 $ 0 $ 1,063 $ 15,368 $ 2,167 $ 43,739 $ 0 $ 61,274           $ 15,368 [1] $ 2,167 [1] $ 42,676 [1] $ 0 [1] $ 60,211 [1]
Exercise of stock options (in shares)                               63,886       63,886
Exercise of stock options                               $ 455 (343) 0 0 $ 112
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration (in shares)                               (19,777)       (19,777)
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration                               $ 0 (445) 0 0 $ (445)
Stock-based compensation (note 14)                               0 2,574 0 0 2,574
Net income for the period                               0 0 17,135 0 17,135 [1],[2]
Accretion of redeemable non-controlling interest in Ting Virginia, LLC.                               0 0 (64) 0 (64)
Other comprehensive income (loss) (note 7)                               $ 0 0 0 (810) $ (810)
Repurchase and retirement of shares (note 13(a)) (in shares)                                       0
Repurchase and retirement of shares (note 13(a))                                       $ 0
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration (in shares)                               (19,777)       (19,777)
Repurchase and retirement of shares (note 13(a)) (in shares)                                       0
Repurchase and retirement of shares (note 13(a))                                       $ 0
Net income                               $ 0 0 17,135 0 17,135 [1],[2]
Other comprehensive income (loss) (note 7)                               $ 0 0 0 (810) (810)
Balances (in shares) at Dec. 31, 2018 [1]                               10,627,988        
Balances at Dec. 31, 2018 [1]                               $ 15,823 3,953 60,810 (810) $ 79,776
Exercise of stock options (in shares)                               80,319       80,319
Exercise of stock options                               $ 967 (572) 0 0 $ 395
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration (in shares)                               (21,332)       (21,332)
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration                               $ 0 (548) 0 0 $ (548)
Stock-based compensation (note 14)                               0 2,876 0 0 2,876
Net income for the period                               0 0 15,398 0 15,398
Other comprehensive income (loss) (note 7)                               $ 0 0 0 1,283 $ 1,283
Repurchase and retirement of shares (note 13(a)) (in shares)                               (101,816)       (101,816)
Repurchase and retirement of shares (note 13(a))                               $ (157) (4,829) 0 0 $ (4,986)
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration (in shares)                               (21,332)       (21,332)
Repurchase and retirement of shares (note 13(a)) (in shares)                               (101,816)       (101,816)
Repurchase and retirement of shares (note 13(a))                               $ (157) (4,829) 0 0 $ (4,986)
Net income                               0 0 15,398 0 15,398
Other comprehensive income (loss) (note 7)                               $ 0 0 0 1,283 1,283
Balances (in shares) at Dec. 31, 2019 [1]                     10,585,159                  
Balances at Dec. 31, 2019                     $ 16,633 [1] $ 880 $ 76,208 $ 473 $ 94,194         $ 94,194
Exercise of stock options (in shares)                               113,132       113,132
Exercise of stock options                               $ 2,290 (1,305) 0 0 $ 985
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration (in shares)                               (48,013)       (48,013)
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration                               $ 0 (556) 0 0 $ (556)
Stock-based compensation (note 14)                               0 3,718 0 0 3,718
Net income for the period                               0 0 5,775 0 5,775
Other comprehensive income (loss) (note 7)                               $ 0 0 0 1,863 $ 1,863
Repurchase and retirement of shares (note 13(a)) (in shares)                               (70,238)       (70,238)
Repurchase and retirement of shares (note 13(a))                               $ (125) (1,279) (1,877) 0 $ (3,281)
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration (in shares)                               (48,013)       (48,013)
Repurchase and retirement of shares (note 13(a)) (in shares)                               (70,238)       (70,238)
Repurchase and retirement of shares (note 13(a))                               $ (125) (1,279) (1,877) 0 $ (3,281)
Acquisition of Cedar Networks (in shares)                               32,374        
Acquisition of Cedar Networks                               $ 2,000 0 0 0 2,000
Net income                               0 0 5,775 0 5,775
Other comprehensive income (loss) (note 7)                               $ 0 0 0 1,863 1,863
Balances (in shares) at Dec. 31, 2020                               10,612,414        
Balances at Dec. 31, 2020                               $ 20,798 $ 1,458 $ 80,106 $ 2,336 $ 104,698
[1] The Company has initially applied ASC 2016-02 (Topic 842) on January 1, 2019 (note 2(u)). The accounting standard was adopted using the modified retrospective method, under this method the comparative period was not restated.
[2] The Company has initially applied ASC 2016-02 (Topic 842) on January 1, 2019 (note 2 (u)). The accounting standard was adopted using the modified retrospective method, under this method the comparative period was not restated.