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Income Taxes (Significant components of the Companys deferred tax liabilities and assets) (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax liabilities: |  |
Property and equipment | $ 4,802,000 | $ 5,181,000
Intangible assets | 20,442,000 | 20,765,000
Prepaid expenses | 426,000 | 376,000
Total deferred tax liabilities | 25,670,000 | 26,322,000
Deferred tax assets: |  |
Allowance for doubtful accounts | 89,000 | 64,000
Compensation | 824,000 | 1,011,000
Other accrued liabilities | 150,000 | 95,000
Deferred Tax Assets, Gross, Total | 1,063,000 | 1,170,000
Less: valuation allowance | 0 | 0
Total net deferred tax assets | 1,063,000 | 1,170,000
Net deferred tax liabilities | 24,607,000 | 25,152,000
Current portion of deferred tax assets | 150,000 | 388,000
Non-current portion of deferred tax liabilities | (24,757,000) | (25,540,000)
Net deferred tax liabilities | $ (24,607,000) | $ (25,152,000)

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