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Balance Sheets (Unaudited) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Current assets:    
Cash and cash equivalents $ 929,270 $ 1,084,991
Accounts receivable, net 2,964,220 2,367,177
Inventories, net 2,495,625 2,272,328
Prepaid expenses and other current assets 367,611 307,832
Deferred cost on shipments to distributors 196,165 165,024
Total current assets 6,952,891 6,197,352
Property and equipment:    
Machinery and office equipment 2,112,263 2,188,835
Computer equipment 1,036,797 992,531
Property and equipment, gross 3,149,060 3,181,366
Accumulated depreciation (2,449,650) (2,492,154)
Property and equipment, net 699,410 689,212
Goodwill 4,427,000 4,427,000
Other long-term assets 226,170 236,565
Deferred tax assets 5,774,268 5,780,938
Operating lease right-of-use asset 1,185,576 1,265,648
Total assets 19,265,315 18,596,715
Current liabilities:    
Accounts payable and accrued expenses 1,680,338 1,533,456
Accrued payroll and related expenses 547,340 512,307
Deferred revenue on shipments to distributors 465,246 396,974
Short term portion of deferred service revenue 38,110 33,644
Bank lines of credit 1,796,284 1,316,778
Term loan – current portion 500,000 500,000
Operating lease – current portion 386,602 376,160
Finance lease – current portion 15,999 15,697
Total current liabilities 5,429,919 4,685,016
Long-term portion of deferred service revenue 50,358 31,291
Long-term portion of term loan 208,333 333,333
Long-term portion of operating lease 1,034,286 1,134,350
Long-term portion of finance lease 4,180 8,290
Total liabilities 6,727,076 6,192,280
Commitments and contingencies
Stockholders’ equity:    
Common stock, $0.001 par value: Authorized – 20,000,000 shares, Issued and outstanding – 5,999,159 shares at March 31, 2019 and 5,883,109 shares at December 31, 2018 5,999 5,883
Additional paid-in capital 60,645,750 60,523,901
Accumulated deficit (48,113,510) (48,125,349)
Total stockholders’ equity 12,538,239 12,404,435
Total liabilities and stockholders’ equity $ 19,265,315 $ 18,596,715