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Stock Options and Restricted Shares - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Stock Options and Restricted Shares
Direct operating costs	$ 37	$ 39	$ 75	$ 79
Selling and administrative expenses	299	259	539	389
Total stock-based compensation	$ 336	$ 298	$ 614	$ 468

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Amount of selling, general and administrative expense classified as other.

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Amount of noncash expense for share-based payment arrangement.

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Amount of noncash expense for option under share-based payment arrangement.

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