Income Taxes (Significant components of the Company's deferred tax liabilities and assets) (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Deferred tax liabilities:
Property and equipment	$ 3,976,000	$ 4,218,000
Intangible assets	23,006,000	22,355,000
Prepaid expenses	490,000	477,000
Total deferred tax liabilities	27,472,000	27,050,000
Deferred tax assets:
Allowance for doubtful accounts	81,000	56,000
Compensation	1,107,000	1,134,000
Other accrued liabilities	162,000	123,000
Gross deferred tax assets	1,350,000	1,313,000
Less: valuation allowance	0	0
Total net deferred tax assets	1,350,000	1,313,000
Net deferred tax liabilities	26,122,000	25,737,000
Current portion of deferred tax assets	296,000	341,000
Non-current portion of deferred tax liabilities	(26,418,000)	(26,078,000)
Net deferred tax liabilities	$ (26,122,000)	$ (25,737,000)