Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 1,049,518	$ 1,277,205
Adjustments to reconcile net income to net cash provided by operating activities:
(Gain) loss on disposal of equipment	(24,988)	2,184
Change in accounts receivable and inventory reserves	105,072	(19,293)
Depreciation and amortization	540,290	379,493
Change in cash surrender value of life insurance	(51,001)	(51,003)
Warranty reserve	240,942	153,493
Compensation expense related to stock options	17,824	7,000
Accounts receivable	1,611,563	450,284
Notes receivable and other non-trade receivables	79,955	208,873
Inventories	(4,430,352)	1,044,841
Prepaid expenses and other	(364,792)	234,341
Accounts payable	461,014	(190,899)
Accrued expenses	705,895	487,210
Income taxes receivable/ payable	(28,000)	636,200
Total adjustments	(1,136,578)	3,342,724
Net cash provided by (used in) operating activities	(87,060)	4,619,929
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(267,523)	(292,513)
Proceeds from sale of assets	39,140	8,000
Net cash used in investing activities	(228,383)	(284,513)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payment of cash dividend	(733,885)	(611,571)
Repurchase of common stock	(1,078,217)
Proceeds from exercise of stock options	25,375
Repurchase of stock options	(222,740)
Net cash used in financing activities	(2,009,467)	(611,571)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(2,324,910)	3,723,845
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	9,197,492	5,814,184
CASH AND CASH EQUIVALENTS AT END OF PERIOD	6,872,582	9,538,029
SUPPLEMENTAL SCHEDULE OF NON-CASH INVESTING ACTIVITIES:
Finished goods inventory transferred to equipment leased to customers	788,239	661,050
Cash paid during the period for:
Interest	5,800	17,000
Income taxes	$ 759,000	$ 82,000