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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Changes in the Allowance for Doubtful Accounts
The following table presents our allowance for doubtful accounts activity for the periods indicated (in thousands):
December 31,
202020192018
Balance at beginning of period
$141 $153 $303 
Charges to costs and expenses
— 26 43 
Deductions
(27)(38)(193)
Balance at end of period
$114 $141 $153 
Summary of Cash and Cash Equivalents and Restricted Cash
The following table provides a reconciliation of cash and cash equivalents and restricted cash as reported in the consolidated balance sheets that totals to the amounts shown in the consolidated statements of cash flows at the dates indicated (in thousands):
December 31,
20202019
Cash and cash equivalents$39,293 $112,994 
Restricted cash12,772 9,261 
Total cash, cash equivalents and restricted cash shown in the
consolidated statements of cash flows$52,065 $122,255 
Schedule of Common Stock
The following table reconciles our outstanding common stock for the periods indicated:

Common
shares
Balance, December 31, 2017 and 20184,217,596 
Issuance of shares in acquisition (see Note 6)
11,145 
Vesting of restricted stock unit awards (see Note 14)
7,604 
Shares withheld to cover taxes upon vesting of restricted stock unit awards(883)
Other71 
Balance, December 31, 20194,235,533 
Vesting of restricted stock unit awards (see Note 14)
10,290 
Shares withheld to cover taxes upon vesting of restricted stock unit awards(2,107)
Balance, December 31, 2020
4,243,716 
Schedule of Earnings per Share, Basic and Diluted
A reconciliation of the calculation of basic and diluted earnings per share was as follows for the periods indicated (in thousands, except per share data):
Year Ended December 31,
202020192018
Earnings per share – numerator:
Net earnings$995 $8,207 $2,945 
Denominator:
Basic weighted average number of shares outstanding4,240 4,228 4,218 
Basic earnings per share$0.23 $1.94 $0.70 
Diluted earnings per share:
Diluted weighted average number of shares outstanding:
Common shares4,240 4,228 4,218 
Restricted stock unit awards (1)
11 5 — 
Performance share unit awards (2)
3 — — 
Total4,254 4,233 4,218 
Diluted earnings per share$0.23 $1.94 $0.70 
_______________
(1)The dilutive effect of restricted stock unit awards for the year ended December 31, 2018 is de minimis.
(2)The dilutive effect of performance share awards are included in the calculation of diluted earnings per share when the performance share award performance conditions have been achieved. The performance conditions for the performance share unit awards granted in 2018, 2019 and 2020 were achieved as of December 31, 2018, 2019 and 2020, respectively. For the years ended December 31, 2019 and 2018, the effects of the performance share awards on earning per share were anti-dilutive.
Schedule of Cost of Retirement Plans Our 401(k) plan contributory expenses were as follows for the periods indicated (in thousands):
Year Ended December 31,
202020192018
Contributory expenses$1,100 $1,117 $808