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Condensed Consolidated Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net income $ 8,666,163 $ 4,389,196
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 1,734,698 1,778,630
Provision for bad debts 271,399 2,472,298
Depreciation and amortization 5,378,708 4,801,859
Change in fair value of contingent consideration   4,415,925
Gain on dispositions (3,545,755)  
Amortization of loan fees 1,451,949 1,415,549
Loss on modification of long-term debt   281,021
Deferred income taxes 1,537,291 2,481,306
Equity in earnings of unconsolidated affiliates 141,378  
Change in operating assets and liabilities:    
Accounts receivable 3,087,481 (6,587,432)
Prepaid expenses (3,512,932) (4,057,747)
Other assets (140,228) (1,511,179)
Accounts payable 4,159,569 6,715,576
Other liabilities 3,950,396 212,056
Other operating activities 133,381 19,050
Net cash provided by operating activities 23,313,498 15,833,485
Cash flows from investing activities:    
Payments for acquisitions (13,500,000) (39,520,000)
Capital expenditures (6,901,243) (3,346,558)
Proceeds from dispositions 3,800,000  
Payments for translator licenses   (52,500)
Payments for investments (5,009,999) (150,000)
Net cash used in investing activities (21,611,242) (43,069,058)
Cash flows from financing activities:    
Issuance of debt 10,000,000 35,000,000
Payments on debt (9,000,000) (7,048,014)
Payments of debt issuance costs   (553,062)
Reduction of finance lease liabilities (50,326)  
Dividends paid (4,150,335) (4,020,751)
Purchase of treasury stock (36,672) (85,489)
Net cash provided by (used in) financing activities (3,237,333) 23,292,684
Net decrease in cash and cash equivalents (1,535,077) (3,942,889)
Cash and cash equivalents at beginning of period 13,433,828 13,922,390
Cash and cash equivalents at end of period 11,898,751 9,979,501
Cash paid for interest 12,217,854 9,993,376
Cash paid for income taxes 3,438,550 273,200
Supplement disclosure of non-cash investing and financing activities:    
Dividends declared but unpaid 1,389,273 1,367,761
Note receivable and accrued interest converted to investment   187,618
Media advertising exchanged for investment 1,000,000  
Postretirement Benefits Plan [Member]    
Adjustments to reconcile net income to net cash provided by operating activities:    
Termination of pension plan   (992,623)
Class A Common Stock [Member]    
Supplement disclosure of non-cash investing and financing activities:    
Class A common stock returned to treasury stock   13,515,406
Common stock issued for acquisition 198,500 $ 29,888
Common stock issued for investment $ 974,125