Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 11,443	$ 13,775
Marketable investments	36,990	40,299
Accounts receivable, net	17,859	16,547
Inventories	15,672	14,977
Other current assets and prepaid expenses	2,403	2,251
Total current assets	84,367	87,849
Property and equipment, net	1,802	1,907
Deferred tax asset	394	377
Intangibles, net		2
Goodwill	1,339	1,339
Other long-term assets	389	380
Total assets	88,291	91,854
Current liabilities:
Accounts payable	3,089	2,598
Accrued liabilities	14,950	17,397
Deferred revenue	8,275	8,394
Total current liabilities	26,314	28,389
Deferred revenue, net of current portion	1,801	1,705
Income tax liability	169	168
Other long-term liabilities	565	582
Total liabilities	28,849	30,844
Commitments and Contingencies (Note 10)
Stockholders’ equity:
Convertible preferred stock, $0.001 par value; authorized: 5,000,000 shares; none issued and outstanding
Common stock, $0.001 par value; authorized: 50,000,000 shares; issued and outstanding: 13,909,182 and 13,773,389 shares at March 31, 2017 and December 31, 2016, respectively	14	14
Additional paid-in capital	87,569	88,114
Accumulated deficit	(28,068)	(27,046)
Accumulated other comprehensive loss	(73)	(72)
Total stockholders’ equity	59,442	61,010
Total liabilities and stockholders’ equity	$ 88,291	$ 91,854