Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income	$ 6,121	$ 6,678	$ 1,511
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,807	2,294	1,731
Deferred income taxes	(1,450)	168	105
Stock compensation expense	582	671	674
Changes in operating assets and liabilities:
Accounts receivable	1,316	(2,298)	539
Prepaid expenses, other current assets and income tax receivable	(133)	822	609
Accounts payable	(990)	144	(98)
Accrued expenses	893	790	(491)
Net cash provided by operating activities	9,146	9,269	4,580
Cash flows from investing activities:
Increase in long-term assets; capitalized patent costs	(49)	(82)	(46)
Purchases of property and equipment and capitalized software development costs	(1,197)	(2,012)	(1,752)
Net cash used in investing activities	(1,246)	(2,094)	(1,798)
Cash flows from financing activities:
Dividends paid	(3,289)	(3,267)	(3,241)
Proceeds from stock options and tax withholding related to vested shares from employee stock plans	(163)	(149)	(106)
Proceeds from equipment financing	2,078	610	1,097
Payments of equipment financing	(2,082)	(3,120)	(1,455)
Net cash used in financing activities	(3,456)	(5,926)	(3,705)
Effect of exchange rate changes on cash and cash equivalents	(217)
Net increase (decrease) in cash and cash equivalents	4,227	1,249	(923)
Cash and cash equivalents, beginning of year	3,938	2,689	3,612
Cash and cash equivalents, end of year	8,165	3,938	2,689
Supplemental disclosures of cash flow information:
Cash paid for income taxes	2,824	1,814	40
Cash paid for interest	70	134	128
Non-cash investing and financing activities:
Purchases of equipment through accounts payable and accrued liabilities	$ 25	$ 472	$ 338