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Statements of Cash Flows (Unaudited) - USD ($)
6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Cash flows from operating activities:    
Net loss $ (831,547) $ (937,618)
Adjustments to reconcile net loss to cash provided by (used in) operating activities:    
Depreciation and amortization 284,209 287,148
Share-based compensation 103,029 111,987
Deferred taxes (270,000) (630,000)
Changes in:    
Accounts receivable-trade (497,231) (746,047)
Inventories (1,652,830) 25,153
Prepaid expenses and other current assets (1,338) (4,332)
Accounts payable 1,064,654 271,934
Deferred revenue (100,000)
Accrued expenses 331,799 215,651
Net cash provided by (used in) operating activities (1,569,255) (1,406,124)
Cash flows from investing activities:    
Purchases of property and equipment (252,250) (59,817)
Net cash provided by (used in) investing activities (252,250) (59,817)
Cash flows from financing activities:    
Net borrowings on line of credit 900,000
Net cash provided by (used in) financing activities 900,000
Net increase (decrease) in cash and cash equivalents (921,505) (1,465,941)
Cash and cash equivalents at beginning of period 1,339,572 3,407,760
Cash and cash equivalents at end of period $ 418,067 $ 1,941,819