Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Nov. 30, 2021	Nov. 30, 2020
Cash flows from operations:
Net income (loss)	$ 212,631	$ (2,103,486)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Stock based compensation	265,541	247,645
Increase (Decrease) in obsolete inventory reserves	(638,633)	556,303
(Gain) Loss on disposal of property, plant, and equipment	(17,935)	25,195
Depreciation and amortization expense	613,409	818,234
Accrued interest on deferred debt payments	16,982	7,536
Change in allowance for doubtful accounts	(12,987)	28,250
Debt forgiveness from Paycheck Protection Program loan	0	(1,242,900)
Deferred income taxes	45,800	(881,638)
Changes in assets and liabilities:
Accounts receivable	(259,439)	(738,879)
Inventories	(809,070)	459,804
Net investment in sales-type leases	28,352	125,435
Other assets	(59,887)	9,649
Accounts payable	(218,313)	750,091
Contracts in progress, net	(116,723)	857,936
Customer deposits	80,284	92,862
Income taxes payable	4,400	(5,300)
Accrued expenses	(120,266)	136,949
Net cash used in operating activities	(985,854)	(856,314)
Cash flows from investing activities:
Purchases of property, plant, and equipment	(620,284)	(693,414)
Net proceeds from sale of assets	20,807	191,764
Net cash used in investing activities	(599,477)	(501,650)
Cash flows from financing activities:
Net change in line of credit	(1,715,000)	219,000
Principal payments on finance lease obligations	(9,046)	0
Proceeds from term debt	0	1,692,900
Repayment of term debt	(90,179)	(85,401)
Repurchases of common stock	(30,470)	(30,996)
Net cash provided by financing activities	1,585,305	1,357,503
Net decrease in cash	(26)	(461)
Cash at beginning of period	2,684	3,145
Cash at end of period	2,658	2,684
Supplemental disclosures of cash flow information:
Interest	270,616	263,598
Income taxes	1,675	28,514
Supplemental disclosures of non-cash investing and financing activities:
Right-of-use (ROU) assets acquired	$ 219,937	$ 27,879