Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income	$ 30,047,000	$ 22,943,000	$ 20,518,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,463,000	4,586,000	4,225,000
Deferred income taxes	1,476,000	(684,000)	798,000
Liability for uncertain tax positions	(288,000)	181,000	73,000
Loss on disposal of property and equipment	186,000	26,000	22,000
Gain on sale of operating segment			(223,000)
Non-cash share-based compensation expense	1,514,000	1,845,000	1,929,000
Change in assets and liabilities, net of effect of acquisition and disposal:
Trade accounts receivable	2,767,000	(2,340,000)	(1,137,000)
Prepaid expenses and other current assets	(833,000)	(565,000)	(535,000)
Deferred contract costs, net	(113,000)
Accounts payable	(39,000)	12,000	(15,000)
Accrued expenses, wages, bonus and profit sharing	(566,000)	1,759,000	440,000
Income taxes receivable and payable	686,000	(1,023,000)	105,000
Deferred revenue	(452,000)	1,351,000	643,000
Net cash provided by operating activities	39,848,000	28,091,000	26,843,000
Cash flows from investing activities:
Purchases of property and equipment	(5,971,000)	(4,568,000)	(3,973,000)
Purchase of equity investment		(1,300,000)
Purchase of intangible content license		(250,000)
Net proceeds from sale of operating segment			223,000
Net cash used in investing activities	(5,971,000)	(6,118,000)	(3,750,000)
Cash flows from financing activities:
Payments related to Recapitalization	(72,370,000)
Proceeds from issuance of note payable	40,000,000
Borrowings on line of credit	2,500,000
Payments on line of credit	(2,500,000)
Payments on notes payable	(3,071,000)	(2,473,000)	(2,199,000)
Payment of debt issuance costs	(187,000)
Payments on capital lease obligations	(157,000)	(108,000)	(95,000)
Cash paid for non-controlling interest			(2,000,000)
Proceeds from exercise of stock options	0	0	548,000
Payment of employee payroll tax withholdings on share-based awards exercised	(1,853,000)	(1,668,000)	(204,000)
Payment of dividends on common stock	(16,859,000)	(16,867,000)	(28,552,000)
Net cash used in financing activities	(54,497,000)	(21,116,000)	(32,502,000)
Effect of exchange rate changes on cash	(1,122,000)	855,000	285,000
Net increase (decrease) in cash and cash equivalents	(21,742,000)	1,712,000	(9,124,000)
Cash and cash equivalents at beginning of period	34,733,000	33,021,000	42,145,000
Cash and cash equivalents at end of period	12,991,000	34,733,000	33,021,000
Supplemental disclosure of cash paid for:
Interest expense, net of $0, $0, and $10 capitalized, respectively	1,282,000	76,000	192,000
Income taxes	2,635,000	12,827,000	9,963,000
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.	121,371,000
Capital lease obligations originated for property and equipment	879,000	74,000	109,000
Stock tendered to the Company for cashless exercise of stock options in connection with equity incentive plans	$ 6,098,000	$ 2,455,000	$ 397,000