Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 1,350,224	$ 2,137,902
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Gain on sale of assets	(22,368)	(103,412)
Change in accounts receivable and inventory reserves	236,211	135,417
Depreciation and amortization	278,357	365,912
Change in cash surrender value of life insurance	(91,704)	(94,133)
Deferred income taxes	405,000	5,000
Warranty reserve	489,000	188,000
Compensation expense related to stock options	1,469	4,800
Change in operating assets and liabilities:
Accounts receivable	2,670,430	(6,041,272)
Notes receivable and other non-trade receivables	110,695	74,477
Inventories	(3,173,042)	(4,698,230)
Prepaid expenses and other assets	(365,636)	(58,957)
Accounts payable	(100,414)	3,476,422
Accrued expenses	(321,952)	(447,582)
Income taxes payable/ receivable	(714,000)	539,000
Total adjustments	(597,954)	(6,654,558)
Net cash provided by (used in) operating activities	752,270	(4,516,656)
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sale of investments	51,035	2,224,532
Purchase of investments		(20,978)
Proceeds from sale of assets	45,246	121,200
Capital expenditures	(1,001,786)	(255,517)
Net cash provided by (used in) investing activities	(905,505)	2,069,237
CASH FLOWS FROM FINANCING ACTIVITIES:
Payment of cash dividend	(611,571)	(802,337)
Payment on capital leases	(8,271)	(12,373)
Proceeds from exercise of stock options	124,350
Tax effect from exercise and forfeiture of stock options	(52,156)
Repurchase of common stock		(391)
Net cash used in financing activities	(547,648)	(815,101)
NET DECREASE IN CASH AND CASH EQUIVALENTS	(700,883)	(3,262,520)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	6,515,067	9,777,587
CASH AND CASH EQUIVALENTS AT END OF YEAR	5,814,184	6,515,067
Cash paid during the year for:
Interest	1,800	3,000
Income taxes	$ 1,088,000	$ 887,000