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Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Cash flows from operating activities:    
Net loss $ (937,618) $ (61,610)
Adjustments to reconcile net loss to cash provided by (used in) operating activities:    
Depreciation and amortization 287,148 271,360
Share-based compensation 111,987 116,085
Deferred taxes (630,000) (40,100)
Excess tax benefit from stock options exercised (2,814)
Changes in:    
Accounts receivable-trade, net (746,047) 1,073,423
Inventories 25,153 217,569
Prepaid expenses and other current assets (4,332) (29,880)
Accounts payable 271,934 (708,920)
Accrued expenses 215,651 (221,057)
Net cash provided by (used in)operating activities (1,406,124) 614,054
Cash flows from investing activities:    
Purchases of property and equipment (59,817) (457,127)
Net cash used in investing activities (59,817) (457,127)
Cash flows from financing activities:    
Proceeds from issuance of common stock 11,835
Excess tax benefit from stock options exercised 2,814
Repurchase of common stock (10,000)
Net cash provided by financing activities 4,649
Net increase (decrease) in cash and cash equivalents (1,465,941) 161,578
Cash and cash equivalents at beginning of period 3,407,760 3,412,649
Cash and cash equivalents at end of period 1,941,819 3,574,227
Supplemental cash flow information:    
Cash paid for taxes $ 8,000