Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 17,610,000	$ 18,156,000	$ 15,484,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, Depletion and Amortization, Nonproduction	4,109,000	3,804,000	3,732,000
Deferred income taxes	(1,361,000)	107,000	58,000
Reserve for uncertain tax positions	$ 93,000	182,000	(42,000)
Loss on disposal of property and equipment		$ 2,000	$ 23,000
Gain on sale from operating segment	$ (1,102,000)
Write-off of purchase option	657,000
Tax benefit from exercise of stock options	25,000	$ 93,000	$ 84,000
Non-cash share-based compensation expense	1,383,000	742,000	955,000
Change in assets and liabilities, net of effect of acquisition and disposal:
Trade accounts receivable	(1,777,000)	2,914,000	970,000
Unbilled revenue	(390,000)	66,000	(386,000)
Prepaid expenses	$ 207,000	$ (2,000)	(166,000)
Other current assets			76,000
Accounts payable	$ (224,000)	$ 163,000	331,000
Accrued expenses, wages, bonus and profit sharing	755,000	(367,000)	212,000
Income taxes receivable and payable	1,504,000	(715,000)	(100,000)
Deferred revenue	397,000	1,052,000	(1,916,000)
Net cash provided by operating activities	21,886,000	26,197,000	19,315,000
Cash flows from investing activities:
Purchases of property and equipment	(2,939,000)	(2,492,000)	$ (2,188,000)
Option purchase		(657,000)
Acquisition, net of cash acquired		(2,574,000)
Net proceeds from sale of operating segment	1,613,000
Net cash used in investing activities	(1,326,000)	(5,723,000)	$ (2,188,000)
Cash flows from financing activities:
Payments on notes payable	(2,328,000)	(2,256,000)	(2,112,000)
Payments on capital lease obligations	(173,000)	(156,000)	(110,000)
Cash paid for non-controlling interest	(2,789,000)
Proceeds from exercise of stock options	0	408,000	840,000
Excess tax benefit from share-based compensation	240,000	622,000	755,000
Repurchase of shares for payroll tax withholdings related to share-based compensation	(92,000)	(348,000)	(55,000)
Purchase of Treasury Stock	(1,673,000)
Payment of dividends on common stock	(10,054,000)		(2,142,000)
Net cash used in financing activities	(16,869,000)	(1,730,000)	(2,824,000)
Effect of exchange rate changes on cash	(1,588,000)	(794,000)	(497,000)
Net increase in cash and cash equivalents	2,103,000	17,950,000	13,806,000
Cash and cash equivalents at beginning of period	40,042,000	22,092,000	8,286,000
Cash and cash equivalents at end of period	42,145,000	40,042,000	22,092,000
Supplemental disclosure of cash paid for:
Interest expense, net of $14, $10, and $24 capitalized, respectively	207,000	284,000	368,000
Income taxes	$ 9,377,000	$ 9,874,000	$ 8,181,000