Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	May 31, 2021	May 31, 2020
Statement of Cash Flows [Abstract]
Net income (loss)	$ 1,027	$ 369
Adjustments to reconcile net income (loss) to net cash provided in operating activities:
Depreciation and amortization	59	59
Operating lease expense	100	93
Net realized and unrealized losses (gains) on investments	(7)	7
Changes in operating assets and liabilties:
Accounts receivable	(1,026)	79
Inventories	94	(420)
Prepaid expenses and other current assets	(21)	(61)
Other assets	3	0
Payments on operating lease liabilities	(111)	(101)
Payments on capital lease liabilities	(3)	0
Accounts payable	362	45
Customer deposits	216	(29)
Accrued expenses and other current and non-current liabilities	207	252
Net cash provided by operating activities	900	293
Investing Activities:
Proceeds from sale of marketable securities	88	169
Purchases of marketable securities	(103)	(222)
Purchases of property and equipment	(4,583)	(23)
Net cash (used in) investing activities	(4,598)	(76)
Financing Activities:
Proceeds from mortgage loan	2,940	0
Principal payments on mortgage loan	(8)	0
Net cash provided by financing activities	2,932	0
Net increase in cash and cash equivalents	(766)	217
Cash and cash equivalents - beginning of the year	3,785	1,332
Cash and cash equivalents - end of period	$ 3,019	$ 1,549