Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 8,336,000	$ 3,199,000
Accounts receivable, net of allowance for doubtful accounts ($10 and $13 at March 31, 2018 and December 31, 2017, respectively)	2,225,000	3,629,000
Inventory, net of allowance for excess and obsolete inventory and lower of cost or estimated net realizable value adjustments of $138 and $140 at March 31, 2018 and December 31, 2017, respectively	479,000	504,000
Prepaid expenses and other current assets	1,751,000	1,663,000
Total current assets	12,791,000	8,995,000
Property and equipment, net	435,000	471,000
Other assets	597,000	613,000
TOTAL ASSETS	13,823,000	10,079,000
Current liabilities:
Accounts payable	301,000	466,000
Accrued liabilities	2,855,000	1,672,000
Deferred revenue	62,000	75,000
Total current liabilities	3,218,000	4,979,000
Deferred revenues - non-current		534,000
Deferred rent	261,000	286,000
Warrant liability	1,275,000	1,489,000
Other liabilities	198,000	197,000
Total liabilities	4,952,000	7,485,000
Stockholders'equity :
Preferred stock: 5,000 shares authorized; none outstanding at March 31, 2018 and December 31, 2017	0	0
Common stock, $0.01 par value; 240,000 shares authorized, 17,089 and 15,385 shares issued and outstanding at March 31, 2018 and December 31, 2017, respectively	171,000	154,000
Additional paid-in capital	119,285,000	113,514,000
Accumulated deficit	(110,585,000)	(111,074,000)
Total stockholders' equity	8,871,000	2,594,000
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 13,823,000	$ 10,079,000