Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Feb. 28, 2021	Feb. 29, 2020
Cash flows from operations:
Net (loss)	$ (315,238)	$ (437,192)
Adjustments to reconcile net (loss) to net cash provided by (used in) operating activities:
Stock based compensation	62,054	37,580
Decrease in obsolete inventory reserves	(216,795)	(118,974)
Gain on disposal of property, plant, and equipment	(8,000)	(1,251)
Depreciation and amortization expense	161,107	227,456
Accrued interest on deferred debt payments	4,161
Change in allowance for doubtful accounts	25,201	10,215
Deferred income taxes	(97,413)	(125,253)
Changes in assets and liabilities:
Accounts receivable	684,378	(987,521)
Inventories	76,951	(416,948)
Net investment in sales-type leases	14,069	37,231
Other assets	(225,977)	(191,484)
Accounts payable	(187,110)	349,256
Contracts in progress, net	(397,920)	559,252
Customer deposits	1,179,196	116,906
Income taxes payable	3,900	17,581
Accrued expenses	(81,262)	(36,982)
Net cash provided by (used in) operating activities	681,302	(960,128)
Cash flows from investing activities:
Purchases of property, plant, and equipment	(163,927)	(267,141)
Net proceeds from sale of assets	8,000	1,251
Net cash used in investing activities	(155,927)	(265,890)
Cash flows from financing activities:
Net change in line of credit	484,000	(1,266,000)
Repayment of term debt	(21,873)	(20,776)
Repurchases of common stock	(18,296)	(19,064)
Net cash provided by (used in) financing activities	(524,169)	1,226,160
Net increase in cash	1,206	142
Cash at beginning of period	2,684	3,145
Cash at end of period	3,890	3,287
Supplemental disclosures of cash flow information:
Interest	48,826	77,238
Income taxes		$ 1,093