Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 22,879,000	$ 26,052,000
Marketable investments	6,448,000	9,523,000
Accounts receivable, net	23,222,000	19,637,000
Inventories	34,042,000	28,014,000
Other current assets and prepaid expenses	5,334,000	3,972,000
Total current assets	91,925,000	87,198,000
Property and equipment, net	2,771,000	2,672,000
Deferred tax asset	459,000	457,000
Operating lease right-of-use assets	8,332,000
Goodwill	1,339,000	1,339,000
Other long-term assets	6,410,000	5,971,000
Total assets	111,236,000	97,637,000
Current liabilities:
Accounts payable	14,140,000	11,279,000
Accrued liabilities	28,096,000	23,300,000
Operating lease liabilities	634,000
Extended warranty liability	2,232,000	3,159,000
Deferred revenue	10,164,000	9,882,000
Total current liabilities	55,266,000	47,620,000
Deferred revenue, net of current portion	3,309,000	2,684,000
Income tax liability	93,000	394,000
Operating lease liabilities, net of current portion	7,888,000
Other long-term liabilities	690,000	553,000
Total liabilities	67,246,000	51,251,000
Commitments and Contingencies (Notes 12 and 13)
Stockholders’ equity:
Common stock, $0.001 par value; authorized: 50,000,000 shares; issued and outstanding: 14,199,821 and 13,968,852 shares at September 30, 2019 and December 31, 2018, respectively	14,000	14,000
Additional paid-in capital	78,305,000	70,451,000
Accumulated deficit	(34,270,000)	(24,010,000)
Accumulated other comprehensive loss	(59,000)	(69,000)
Total stockholders’ equity	43,990,000	46,386,000
Total liabilities and stockholders’ equity	$ 111,236,000	$ 97,637,000