Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Nov. 30, 2020	Nov. 30, 2019
Cash flows from operations:
Net (loss)	$ (2,103,486)	$ (1,419,586)
Adjustments to reconcile net (loss) to net cash provided by operating activities:
Stock based compensation	247,645	195,416
Increase in obsolete inventory reserves	556,303	79,265
(Gain) Loss on disposal of property, plant, and equipment	25,195	(9,999)
Depreciation and amortization expense	818,234	1,003,541
Accrued interest on deferred debt payments	7,536
Change in allowance for doubtful accounts	28,250	(2,175)
Debt forgiveness from Paycheck Protection Program loan	(1,242,900)
Deferred expense (benefit)	(881,638)	(353,626)
Changes in assets and liabilities:
Accounts receivable	(738,879)	(140,687)
Inventories	459,804	1,399,330
Net investment in sales-type leases	125,435	123,055
Other assets	9,649	54,158
Accounts payable	750,091	403,251
Contracts in progress, net	857,936	(723,463)
Customer deposits	92,862	(40,269)
Income taxes payable	(5,300)
Accrued expenses	136,949	239,542
Net cash provided by (used in) operating activities	(856,314)	807,753
Cash flows from investing activities:
Purchases of property, plant, and equipment	(693,414)	(447,025)
Net proceeds from sale of assets	191,764	899,713
Net cash provided by (used in) investing activities	(501,650)	452,688
Cash flows from financing activities:
Net change in line of credit	219,000	927,000
Proceeds from term debt	1,692,900
Repayment of term debt	(85,401)	(314,485)
Repurchases of common stock	(30,996)	(19,323)
Net cash provided by (used in) financing activities	1,357,503	(1,260,808)
Net (decrease) in cash	(461)	(367)
Cash at beginning of period	3,145	3,512
Cash at end of period	2,684	3,145
Supplemental disclosures of cash flow information:
Interest	263,598	329,356
Income taxes	$ 28,514	$ 3,855