STATEMENTS OF CASH FLOWS - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating Activities:
Net loss	$ (1,274,000)	$ (576,000)
Adjustments to reconcile net loss to net cash provided by (used) in operating activities:
Depreciation and amortization	1,001,000	1,101,000
Changes in allowance for doubtful accounts	16,000	41,000
Deferred income tax expense	(205,000)	0
Stock-based compensation expense	317,000	150,000
Gain on sale of property and equipment	0	5,000
Changes in operating assets and liabilities:
Accounts receivable	(2,040,000)	338,000
Inventories	(1,000)	(184,000)
Income tax receivable	355,000	(324,000)
Prepaid expenses and other	192,000	(266,000)
Accounts payable	777,000	(1,271,000)
Accrued liabilities	377,000	(1,098,000)
Income tax payable	20,000	(184,000)
Deferred revenue	586,000	(128,000)
Net cash provided by (used in) operating activities	121,000	(2,406,000)
Investing Activities:
Purchases of property and equipment	(822,000)	(524,000)
Proceeds from sale or maturity of investments	0	6,071,000
Proceeds received from sale of property and equipment	0	5,000
Net cash provided by (used in) investing activities	(822,000)	5,552,000
Financing Activities:
Cash dividends paid ($0.70 per share)	(8,177,000)	0
Proceeds from issuance of common stock, net	0	44,000
Repurchase of common stock upon vesting of restricted stock awards	(14,000)	0
Repurchase of common stock, net	0	(301,000)
Net cash used in financing activities	(8,191,000)	(257,000)
Increase (decrease) in cash and cash equivalents	(8,892,000)	2,889,000
Cash and cash equivalents at beginning of period	12,267,000	8,523,000
Cash and cash equivalents at end of period	3,375,000	11,412,000
Supplemental disclosures for cash flow information:
Cash paid during the period for income taxes	2,000	238,000
Non-cash investing and financing activities:
Purchases of property and equipment included in accounts payable	$ 115,000	$ 0