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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]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balances (in shares) at Dec. 31, 2017           9,619,755        
Beginning balance (Accounting Standards Update 2014-09 [Member]) at Dec. 31, 2017 $ 0 $ 0 $ (875) $ 0 $ (875)          
Beginning balance at Dec. 31, 2017           $ 96 $ 119,856 $ 81,757 $ (1,445) $ 200,264
Net income           0 0 20,312 0 20,312
Pension liability adjustment           0 0 0 (115) (115)
Unrealized gain (loss) on cash flow hedges, net of tax expense/benefit           $ 0 0 0 24 24
Issuance of common stock under stock compensation plans (in shares)           115,300        
Issuance of common stock under stock compensation plans           $ 1 (1,302) 0 0 (1,301)
Share-based compensation expense           $ 0 281 0 0 281
Balances (in shares) at Dec. 31, 2018           9,735,055        
Ending balance (Accounting Standards Update 2018-02 [Member]) at Dec. 31, 2018 $ 0 $ 0 $ 235 $ (235) $ 0          
Ending balance at Dec. 31, 2018           $ 97 118,835 101,194 (1,536) 218,590
Net income           0 0 27,902 0 27,902
Pension liability adjustment           0 0 0 16 16
Unrealized gain (loss) on cash flow hedges, net of tax expense/benefit           $ 0 0 0 (59) (59)
Issuance of common stock under stock compensation plans (in shares)           11,924        
Issuance of common stock under stock compensation plans           $ 0 0 0 0 0
Share-based compensation expense           $ 0 1,709 0 0 1,709
Balances (in shares) at Dec. 31, 2019           9,746,979        
Ending balance at Dec. 31, 2019           $ 97 120,544 129,331 (1,814) 248,158
Net income           0 0 19,050 0 19,050
Pension liability adjustment           0 0 0 (25) (25)
Unrealized gain (loss) on cash flow hedges, net of tax expense/benefit           $ 0 0 0 (27) (27)
Issuance of common stock under stock compensation plans (in shares)           58,458        
Issuance of common stock under stock compensation plans           $ 1 (619) 0 0 (618)
Share-based compensation expense           $ 0 3,088 0 0 3,088
Balances (in shares) at Dec. 31, 2020           9,805,437        
Ending balance at Dec. 31, 2020           $ 98 $ 123,013 $ 148,381 $ (1,866) $ 269,626