STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating Activities:
Net income (loss)	$ (322,000)	$ 96,000
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	460,000	285,000
Changes in allowance for doubtful accounts	(30,000)	17,000
Deferred income tax expense		119,000
Stock-based compensation expense	26,000	83,000
Changes in operating assets and liabilities:
Accounts receivable	2,155,000	733,000
Inventories	(97,000)	14,000
Income tax receivable	(259,000)	(53,000)
Prepaid expenses and other	38,000	152,000
Accounts payable	(1,243,000)	(279,000)
Accrued liabilities	(1,072,000)	(531,000)
Income tax payable	(175,000)	9,000
Excess tax benefit from stock-based awards		(2,000)
Deferred revenue	197,000	501,000
Net cash provided by (used in) operating activities	(322,000)	1,144,000
Investing Activities:
Purchases of property and equipment	(318,000)	(75,000)
Purchases of investments		(889,000)
Proceeds from sale or maturity of investments	1,855,000	732,000
Net cash provided by (used in) investing activities	1,537,000	(232,000)
Financing Activities:
Proceeds from issuance of common stock	45,000	63,000
Excess tax benefit from stock-based awards		2,000
Repurchase of common stock, net	(106,000)	(93,000)
Net cash used in financing activities	(61,000)	(28,000)
Increase in cash and cash equivalents	1,154,000	884,000
Cash and cash equivalents at beginning of period	8,523,000	7,237,000
Cash and cash equivalents at end of period	9,677,000	8,121,000
Supplemental disclosures for cash flow information:
Cash paid during the period for income taxes	$ 207,000	$ 3,000