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Income Taxes (Significant components of the Company's deferred tax liabilities and assets) (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax liabilities: |  |
Property and equipment | $ 4,242,000 | $ 4,802,000
Intangible assets | 21,425,000 | 20,442,000
Prepaid expenses | 405,000 | 426,000
Total deferred tax liabilities | 26,072,000 | 25,670,000
Deferred tax assets: |  |
Allowance for doubtful accounts | 43,000 | 89,000
Compensation | 1,093,000 | 824,000
Other accrued liabilities | 134,000 | 150,000
Deferred Tax Assets, Gross, Total | 1,270,000 | 1,063,000
Less: valuation allowance | 0 | 0
Total net deferred tax assets | 1,270,000 | 1,063,000
Net deferred tax liabilities | 24,802,000 | 24,607,000
Current portion of deferred tax assets | 361,000 | 150,000
Non-current portion of deferred tax liabilities | (25,163,000) | (24,757,000)
Net deferred tax liabilities | $ (24,802,000) | $ (24,607,000)

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