Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 27, 2021	Mar. 28, 2020
Cash flows from operating activities:
Net income	$ 30,903	$ 601,654
Adjustments to reconcile net income to cash used in operating activities:
Depreciation and amortization	148,743	128,759
Share-based compensation	27,422	65,673
Gain on sale of property and equipment	(12,000)	(5,000)
Changes in:
Accounts receivable-trade	(863,403)	(1,872,279)
Inventories	78,319	(495,514)
Prepaid expenses and other current assets	(221,769)	(79,673)
Accounts payable	594,037	1,185,445
Accrued expenses	(272,543)	(123,245)
Deferred revenue	307,039	360,106
Net cash used in operating activities	(183,252)	(234,074)
Cash flows from investing activities:
Purchases of property and equipment	(42,488)	(107,600)
Proceeds from sale of property and equipment	12,000	5,000
Net cash used in investing activities	(30,488)	(102,600)
Cash flows from financing activities:
Net borrowings on line of credit	193,395	327,918
Proceeds from exercise of employee stock options	10,310
Payments on note payable	(17,250)	(2,954)
Net cash provided by financing activities	186,455	324,964
Net decrease in cash and cash equivalents	(27,285)	(11,710)
Cash and cash equivalents at beginning of period	195,203	133,965
Cash and cash equivalents at end of period	167,918	122,255
Supplemental disclosures of cash flows information:
Cash paid for interest	14,831	33,216
Supplemental disclosures of non-cash activity:
Net exercise of stock options	1,205,186
Issuance of note payable to finance equipment purchase		$ 208,583