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Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Cash flows from operating activities:    
Net loss $ (574,186) $ (604,402)
Adjustments to reconcile net loss to cash used in operating activities:    
Depreciation and amortization 142,104 141,376
Share-based compensation 72,028 74,413
Deferred taxes (190,000) (446,792)
Changes in:    
Accounts receivable-trade (638,432) 206,487
Inventories (902,519) 23,110
Prepaid expenses and other current assets 344 (36,384)
Accounts payable 942,191 221,938
Accrued expenses 82,228 (78,634)
Net cash used in operating activities (1,066,242) (498,888)
Cash flows from investing activities:    
Purchases of property and equipment (142,750) (33,259)
Net cash used in investing activities (142,750) (33,259)
Net decrease in cash and cash equivalents (1,208,992) (532,147)
Cash and cash equivalents at beginning of period 1,339,572 3,407,760
Cash and cash equivalents at end of period $ 130,580 $ 2,875,613