Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Aug. 31, 2021	Aug. 31, 2020
Cash flows from operations:
Net (loss)	$ (194,692)	$ (1,662,523)
Adjustments to reconcile net (loss) to net cash provided by (used in) operating activities:
Stock based compensation	203,245	195,662
Increase (decrease) in obsolete inventory reserves	(485,073)	180,758
Gain on disposal of property, plant, and equipment	(7,998)	(47,169)
Depreciation and amortization expense	453,697	648,084
Accrued interest on deferred debt payments	12,720	3,330
Increase (decrease) in allowance for doubtful accounts	(10,593)	20,009
Deferred income taxes	(58,843)	(436,692)
Changes in assets and liabilities:
Accounts receivable	(554,351)	(63,526)
Inventories	(1,041,390)	(424,849)
Net investment in sales-type leases	28,352	105,933
Other assets	(213,955)	(96,868)
Accounts payable	228,455	223,680
Contracts in progress, net	(58,695)	920,172
Customer deposits	506,107	16,972
Income taxes payable	3,900	0
Accrued expenses	(58,634)	58,088
Net cash (used in) operating activities	(1,247,748)	(358,939)
Cash flows from investing activities:
Purchases of property, plant, and equipment	(487,515)	(614,443)
Net proceeds from sale of assets	8,000	182,881
Net cash used in investing activities	(479,515)	(431,562)
Cash flows from financing activities:
Net change in line of credit	(1,930,500)	811,000
Proceeds from term debt	0	1,692,900
Repayment of term debt	(67,444)	(63,808)
Repurchases of common stock	(30,471)	(26,536)
Net cash provided by financing activities	1,832,585	791,556
Net increase in cash	105,322	1,055
Cash at beginning of period	2,684	3,145
Cash at end of period	108,006	4,200
Supplemental disclosures of cash flow information:
Interest	190,764	205,409
Income taxes	$ 2,869	$ 30,394