Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Feb. 28, 2022	Feb. 28, 2021
Cash flows from operations:
Net income (loss)	$ (406,489)	$ (315,238)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Stock based compensation	69,964	62,054
Increase (Decrease) in obsolete inventory reserves	(140,485)	(216,795)
Gain on disposal of property, plant, and equipment	0	(8,000)
Depreciation and amortization expense	167,542	161,107
Accrued interest on deferred debt payments	4,213	4,161
Increase (decrease) in allowance for doubtful accounts	(11,440)	25,201
Deferred income taxes	(109,039)	(97,413)
Changes in assets and liabilities:
Accounts receivable	1,091,906	684,378
Inventories	(349,727)	76,951
Net investment in sales-type leases	0	14,069
Other assets	(506,294)	(225,977)
Accounts payable	(183,362)	(187,110)
Contracts in progress, net	119,397	(397,920)
Customer deposits	1,616,276	1,179,196
Income taxes payable	(500)	3,900
Accrued expenses	(193,146)	(81,262)
Net cash provided by operating activities	1,168,816	681,302
Cash flows from investing activities:
Purchases of property, plant, and equipment	(174,133)	(163,927)
Net proceeds from sale of assets	0	8,000
Net cash used in investing activities	(174,133)	(155,927)
Cash flows from financing activities:
Net change in line of credit	924,000	484,000
Principal payments on finance lease obligations	(11,946)	0
Repayment of term debt	(23,029)	(21,873)
Repurchases of common stock	(34,905)	(18,296)
Net cash used in financing activities	(993,880)	(524,169)
Net decrease in cash	803	1,206
Cash at beginning of period	2,658	2,684
Cash at end of period	3,461	3,890
Supplemental disclosures of cash flow information:
Interest	69,754	48,826
Income taxes	$ 0	$ 0