Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	May 31, 2021	May 31, 2020
Cash flows from operations:
Net (loss)	$ (251,148)	$ (1,238,913)
Adjustments to reconcile net (loss) to net cash provided by (used in) operating activities:
Stock based compensation	141,799	152,752
Decrease in obsolete inventory reserves	(144,933)	(191,997)
Gain on disposal of property, plant, and equipment	(7,998)	8,306
Depreciation and amortization expense	308,267	459,436
Accrued interest on deferred debt payments	8,416
Change in allowance for doubtful accounts	9,939	10,478
Deferred income taxes	(74,192)	(332,417)
Changes in assets and liabilities:
Accounts receivable	(24,231)	(483,894)
Inventories	(1,088,928)	(562,207)
Net investment in sales-type leases	17,235	76,180
Other assets	(284,598)	(142,341)
Accounts payable	(276,807)	(8,121)
Contracts in progress, net	(346,797)	744,382
Customer deposits	786,985	119,949
Income taxes payable	3,900
Accrued expenses	(116,948)	69,630
Net cash (used in) operating activities	(1,340,039)	(1,318,777)
Cash flows from investing activities:
Purchases of property, plant, and equipment	(318,958)	(412,294)
Net proceeds from sale of assets	8,000	5,000
Net cash used in investing activities	(310,958)	(407,294)
Cash flows from financing activities:
Net change in line of credit	(1,729,000)	(552,000)
Proceeds from term debt		1,242,900
Repayment of term debt	(44,998)	(42,490)
Repurchases of common stock	(30,471)	(26,536)
Net cash provided by financing activities	1,653,531	1,725,874
Net increase in cash	2,534	(197)
Cash at beginning of period	2,684	3,145
Cash at end of period	5,218	2,948
Supplemental disclosures of cash flow information:
Interest	110,180	138,280
Income taxes	$ 2,869	$ 30,394