Balance Sheets (Current Period Unaudited) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 31,824,000	$ 30,657,000
Accounts receivable, trade, net of allowance for doubtful accounts of $0 at March 31, 2019 and December 31, 2018	2,927,000	3,045,000
Inventories	4,060,000	3,509,000
Prepaid expenses and other current assets	346,000	353,000
Total current assets	39,157,000	37,564,000
Property and equipment
Leasehold improvements	1,284,000	1,284,000
Furniture and computer equipment	704,000	706,000
Manufacturing and other equipment	1,803,000	1,657,000
Subtotal	3,791,000	3,647,000
Less: Accumulated depreciation	(2,424,000)	(2,328,000)
Net property and equipment	1,367,000	1,319,000
Operating lease right-of-use assets	1,196,000
Investment in SAVSU	6,317,000	6,548,000
Long-term deposits	36,000	36,000
Total assets	48,073,000	45,467,000
Current liabilities
Accounts payable	1,264,000	720,000
Accrued expenses and other current liabilities	142,000	91,000
Accrued compensation	630,000	998,000
Lease liability - operating, current portion	651,000
Lease liability – financing, current portion	14,000
Deferred rent, current portion		130,000
Total current liabilities	2,701,000	1,939,000
Deferred rent, long-term		349,000
Long-term lease liability - operating	980,000
Long-term lease liability - financing	13,000
Other long-term liabilities	13,000	31,000
Total liabilities	3,707,000	2,319,000
Commitments and Contingencies (Note 8)
Shareholders’ equity
Common stock, $0.001 par value; 150,000,000 shares authorized, 18,717,095 and 18,547,406 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively	19,000	19,000
Additional paid-in capital	114,951,000	114,160,000
Accumulated deficit	(70,604,000)	(71,031,000)
Total shareholders’ equity	44,366,000	43,148,000
Total liabilities and shareholders’ equity	$ 48,073,000	$ 45,467,000