Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income	$ 27,833,000	$ 29,048,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and impairment	5,016,000	4,623,000
Deferred income taxes	(120,000)	(134,000)
Reserve for uncertain tax positions	210,000	150,000
Non-cash share-based compensation expense	275,000	747,000
Gain on insurance recoveries for damaged property	0	(260,000)
Loss on disposal of property and equipment	1,000	0
Net changes in assets and liabilities:
Trade accounts receivable	(2,188,000)	(5,830,000)
Prepaid expenses and other current assets	231,000	(478,000)
Insurance recoverable	0	(913,000)
Deferred contract costs, net	318,000	(339,000)
Operating lease assets and liabilities, net	17,000	(5,000)
Accounts payable	(207,000)	(681,000)
Accrued expenses, wages, bonuses	(202,000)	473,000
Income taxes receivable and payable	1,604,000	(2,974,000)
Deferred revenue	1,482,000	992,000
Net cash provided by operating activities	34,270,000	24,419,000
Cash flows from investing activities:
Purchases of property and equipment	(3,797,000)	(2,435,000)
Insurance proceeds for damaged property	0	260,000
Acquisition consideration	(3,000,000)	0
Net cash used in investing activities	(6,797,000)	(2,175,000)
Cash flows from financing activities:
Payments on notes payable	(3,049,000)	(2,575,000)
Payment of debt issuance costs	0	(36,000)
Payments on finance lease obligations	(369,000)	(187,000)
Proceeds from the exercise of share-based awards	304,000	1,592,000
Payment of employee payroll tax withholdings on share-based awards exercised	(461,000)	(1,859,000)
Payment of dividends on common stock	(6,105,000)	(10,517,000)
Net cash used in financing activities	(9,680,000)	(13,582,000)
Effect of exchange rate changes on cash	(1,000)	(324,000)
Change in cash and cash equivalents	17,792,000	8,338,000
Cash and cash equivalents at beginning of period	34,690,000	13,517,000
Cash and cash equivalents at end of period	52,482,000	21,855,000
Supplemental disclosure of cash paid for:
Interest, net of capitalized amounts	1,186,000	1,315,000
Income taxes	6,601,000	5,034,000
Supplemental disclosure of non-cash investing and financing activities:
Finance lease obligations originated for property and equipment	0	771,000
Stock tendered to the Company for cashless exercise of stock options in connection with equity incentive plans	749,000	5,560,000
Deferred acquisition consideration	$ 1,950,000	$ 0