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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2021
Supplemental Cash Flow Information |
Supplemental cash flow information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2021 |  | 2020 |  | 2019
​ | ​ | (In thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash paid during the period for: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest | ​ | $ | 253 | ​ | $ | 311 | ​ | $ | 635
Income taxes | ​ | $ | 3,450 | ​ | $ | 1,099 | ​ | $ | 3,893
Non-cash transactions: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Barter revenue | ​ | $ | 2,125 | ​ | $ | 2,014 | ​ | $ | 3,560
Barter expense | ​ | $ | 2,124 | ​ | $ | 1,881 | ​ | $ | 3,370
Acquisition of property and equipment | ​ | $ | — | ​ | $ | 6 | ​ | $ | 28
Use of treasury shares for 401(k) match | ​ | $ | 221 | ​ | $ | 250 | ​ | $ | 262

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