Condensed Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 1,466,636	$ 1,669,860
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Gain on sale of marketable securities	(10,954)
Loss (gain) on sale of property and equipment	(23,617)	4,363
Change in accounts receivable and inventory reserves	49,745	(25,570)
Depreciation and amortization	752,412	532,770
Change in cash surrender value of life insurance	(106,426)	(97,513)
Deferred income taxes	911,000	25,000
Warranty reserve	357,350	184,000
Compensation expense related to stock options	23,198	13,000
Change in operating assets and liabilities:
Accounts receivable	1,355,998	(2,692,701)
Notes receivable and other non-trade receivables	(1,384,725)	(48,002)
Inventories	(4,023,176)	4,590,984
Prepaid expenses and other assets	(247,923)	139,799
Accounts payable	684,685	(258,227)
Accrued expenses	115,184	(30,839)
Income taxes payable/ receivable	(474,000)	355,000
Total adjustments	(2,021,249)	2,692,064
Net cash (used in) provided by operating activities	(554,613)	4,361,924
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of marketable securities	(1,734,887)
Proceeds from sale of marketable securities	274,543
Proceeds from sale of property and equipment	40,737	8,000
Capital expenditures	(1,283,168)	(375,045)
Net cash used in investing activities	(2,702,775)	(367,045)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payment of cash dividend	(733,885)	(611,571)
Repurchase off common stock	(1,078,216)
Repurchase of stock options	(394,490)
Proceeds from exercise of stock options	25,375
Net cash used in financing activities	(2,181,216)	(611,571)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(5,438,604)	3,383,308
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	9,197,492	5,814,184
CASH AND CASH EQUIVALENTS AT END OF YEAR	3,758,888	9,197,492
SUPPLEMENTAL SCHEDULE OF NON-CASH INVESTING ACTIVITIES:
Change in fair value of marketable securities	(10,780)
Finished goods inventory transferred to equipment leased to customers		661,049
Cash paid during the year for:
Interest	6,000	22,000
Income taxes	$ 755,000	$ 675,000