XML 14 R6.htm IDEA: XBRL DOCUMENT v3.20.1
Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Operating activities    
Net income (loss) $ (90,327) $ 11,839
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Stock-based compensation 132,065 121,965
Depreciation and amortization 147,279 100,515
Deferred tax expenses (benefits) 6,670
Changes in operating assets and liabilities:    
Accounts receivable 22,515 (597,043)
Inventories (115,811) (223,297)
Prepaid expenses and other current assets 6,045 (59,779)
Accounts payable and accrued expenses (91,243) 146,882
Accrued payroll and related expenses (29,180) 35,033
Net deferred revenue on shipments to distributors (10,026) 37,131
Deferred service revenue (8,047) 23,533
Net change in operating lease (14,060) (9,550)
Net cash used in operating activities (50,790) (406,101)
Investing activities    
Purchases of equipment (154,681) (100,318)
Net cash used in investing activities (154,681) (100,318)
Financing activities    
Payments on finance leases (4,111) (3,808)
Proceeds from borrowings under bank line of credit agreement 3,980,000 4,109,000
Repayments of borrowings under bank line of credit agreement (3,452,957) (3,629,494)
Repayments of bank term loan (125,000) (125,000)
Common stock repurchases and related expenses (8,496)
Net cash provided by financing activities 389,436 350,698
Net increase (decrease) in cash and cash equivalents 183,965 (155,721)
Cash and cash equivalents at beginning of period 958,860 1,084,991
Cash and cash equivalents at end of period 1,142,825 929,270
Supplemental disclosure of cash flow information    
Cash paid for interest $ 19,650 $ 25,331