STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating Activities:
Net loss	$ (1,725,000)	$ (409,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	665,000	785,000
Changes in allowance for doubtful accounts	26,000	19,000
Deferred income tax expense	(205,000)	0
Stock-based compensation expense	274,000	108,000
Changes in operating assets and liabilities:
Accounts receivable	14,000	1,589,000
Inventories	(20,000)	(179,000)
Income tax receivable	351,000	(464,000)
Prepaid expenses and other	82,000	(36,000)
Accounts payable	(276,000)	(973,000)
Accrued liabilities	(72,000)	(947,000)
Income tax payable	14,000	(184,000)
Deferred revenue	634,000	232,000
Net cash used in operating activities	(238,000)	(459,000)
Investing Activities:
Purchases of property and equipment	(644,000)	(393,000)
Proceeds from sale or maturity of investments	0	3,288,000
Net cash provided by (used in) investing activities	(644,000)	2,895,000
Financing Activities:
Cash dividends paid ($0.70 per share)	(8,177,000)	0
Proceeds from issuance of common stock, net	(8,000)	60,000
Repurchase of common stock, net	0	(247,000)
Net cash used in financing activities	(8,185,000)	(187,000)
Increase (decrease) in cash and cash equivalents	(9,067,000)	2,249,000
Cash and cash equivalents at beginning of period	12,267,000	8,523,000
Cash and cash equivalents at end of period	3,200,000	10,772,000
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	$ 65,000	$ 0