Share-Based Compensation and Stock Repurchases (Narrative) (Details) - USD ($)						1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended			21 Months Ended	36 Months Ended
	Apr. 18, 2022	Dec. 16, 2020	Dec. 16, 2020	Mar. 10, 2020	Mar. 05, 2020	Apr. 30, 2021	Jun. 30, 2021	Sep. 30, 2018	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2022	Mar. 14, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized estimated compensation cost related to non-vested stock options granted									$ 36,000				$ 36,000
Recognition period of unrecognized compensation cost									1 year
Number of Stock Options, Granted									0
Stock option expiry period									5 years
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense									$ 212,000	$ 402,000	$ 460,000
Proceeds from stock option exercises													$ 0
2020 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock authorized for issuance											1,250,000
Common Stock shares remaining for future issuances											234,955
Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock authorized for issuance									1,505,598				1,505,598
Number of Stock Options, Granted											38,803
Class A [Member] | Maximum [Member] | 2020 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares authorized									506,748
Class B [Member] | 2020 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock authorized for issuance										200,000		200,000
2017 Stock Repurchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase program, amount authorized				$ 25,000,000.0
Repurchase program, remaining amount authorized									$ 26,000,000.0				$ 26,000,000.0
Stock buy-back program period									2 years
2017 Stock Repurchase Plan [Member] | Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase program, remaining amount authorized				$ 26,000,000.0
$25 Million Stock Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase program, amount authorized														$ 25,000,000.0
$25 Million Stock Repurchase Program [Member] | Class A Nonvoting Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase value									$ 24,000,000.0				24,000,000.0
Share price									$ 13.39
Shares repurchased plan, shares									1,792,819
$25 Million Stock Repurchased At $8.92 [Member] | Class A Nonvoting Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price							$ 8.92
Shares repurchased plan, shares							75,157					0
$25 Million Stock Repurchased At $7.30 [Member] | Class A Nonvoting Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price					$ 7.30
Shares repurchased plan, shares					25,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense									$ 1,700,000	$ 1,800,000
Unrecognized estimated compensation cost related to non-vested stock options granted									$ 3,200,000				$ 3,200,000
Vesting period of stock options and RSU			1 year						4 years
Number of options, Granted			114,803	287,163		262,830			1,561,690
Restricted Stock Units (RSUs) [Member] | Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage			100.00%					100.00%	25.00%
Restricted Stock Units (RSUs) [Member] | Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage						50.00%
Non-employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Stock Options, Granted		38,803
Non-employee Director [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options, Granted		60,084
Non-employee Director [Member] | Restricted Stock Units (RSUs) [Member] | Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage		75.00%
Vesting period of stock options and RSU		4 years
Non-employee Director [Member] | Restricted Stock Units (RSUs) [Member] | Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage		25.00%
Non-employee Director [Member] | Restricted Stock Units (RSUs) [Member] | Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage		50.00%
Vesting period of stock options and RSU		4 years
Executive Management And Other Employees [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options, Granted	428,899
Employees [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of stock options and RSU						4 years
Number of options, Granted						22,888
Employees [Member] | Restricted Stock Units (RSUs) [Member] | Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage						25.00%