Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 37,260	$ 32,406	$ 30,047
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and impairment	7,505	5,539	5,463
Deferred income taxes	(134)	1,099	1,476
Reserve for uncertain tax positions	185	39	(288)
Gain on insurance recoveries for damaged property	(260)
Loss on disposal of property and equipment	12	(6)	186
Non-cash share-based compensation expense	680	1,224	1,514
Change in assets and liabilities:
Trade accounts receivable	(2,271)	311	2,767
Prepaid expenses and other current assets	(827)	(529)	(833)
Operating lease assets and liability, net	16	(8)
Deferred contract costs, net	(351)	(719)	(113)
Accounts payable	(247)	647	(39)
Accrued expenses, wages and bonuses	1,370	806	(566)
Income taxes receivable and payable	(1,529)	11	686
Deferred revenue	(773)	97	(452)
Net cash provided by operating activities	40,636	40,917	39,848
Cash flows from investing activities:
Purchases of property and equipment	(3,984)	(4,656)	(5,971)
Insurance proceeds for damaged property	260
Net cash used in investing activities	(3,724)	(4,656)	(5,971)
Cash flows from financing activities:
Payments related to Recapitalization			(72,370)
Proceeds from issuance of note payable			40,000
Borrowings on line of credit		21,000	2,500
Payments on line of credit		(21,000)	(2,500)
Payments on notes payable	(3,568)	(3,715)	(3,071)
Payment of debt issuance costs	(36)		(187)
Payments on finance lease obligations	(332)	(229)	(157)
Proceeds from the exercise of stock options	1,734	0	0
Payment of employee payroll tax withholdings on share-based awards exercised	(2,784)	(1,103)	(1,853)
Payment of dividends on common stock	(10,517)	(31,299)	(16,859)
Net cash used in financing activities	(15,503)	(36,346)	(54,497)
Effect of exchange rate changes on cash	(236)	611	(1,122)
Net increase (decrease) in cash and cash equivalents	21,173	526	(21,742)
Cash and cash equivalents at beginning of period	13,517	12,991	34,733
Cash and cash equivalents at end of period	34,690	13,517	12,991
Supplemental disclosure of cash paid for:
Interest expense, net of capitalized amounts	1,735	2,014	1,282
Income taxes	5,217	6,946	2,635
Supplemental disclosure of non-cash investing and financing activities:
Common stock (formerly class A) issued in the Recapitalization in exchange for then-existing class B shares and options.			121,371
Finance lease obligations originated for property and equipment	817	192	879
Stock tendered to the Company for cashless exercise of stock options in connection with equity incentive plans	$ 7,217	$ 3,618	$ 6,098