Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 72,797	$ 138,511
Adjustments to reconcile net income to net cash used in operating activities:
Gain on sale of marketable securities	(8,410)
Gain on sale of property and equipment	(187,794)
Change in accounts receivable and inventory reserves	(146,802)	19,042
Depreciation and amortization	216,540	144,301
Change in cash surrender value of life insurance	(17,001)	(17,001)
Warranty reserve	41,200	37,447
Compensation expense related to stock options	5,375	5,657
Change in operating assets and liabilities:
Accounts receivable	386,503	619,198
Notes receivable and other non-trade receivables	275,114	(113,682)
Inventories	(2,603,752)	(3,192,978)
Prepaid expenses and other assets	331,869	92,133
Accounts payable	48	1,856,066
Accrued expenses	(52,301)	105,310
Income taxes receivable/ payable	21,602	(236,000)
Total adjustments	(1,737,809)	(680,507)
Net cash used in operating activities	(1,665,012)	(541,996)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of marketable securities	(108,467)
Proceeds from sale of marketable securities	458,092
Proceeds from sale of property and equipment	548,771
Capital expenditures	(275,016)	(97,415)
Net cash provided by investing activities	623,380	(97,415)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from line of credit	863,050
Payment of cash dividend		(733,885)
Repurchase of stock options	(47,160)
Net cash provided by financing activities	815,890	(733,885)
NET DECREASE IN CASH AND CASH EQUIVALENTS	(225,742)	(1,373,296)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	3,758,888	9,197,492
CASH AND CASH EQUIVALENTS AT END OF PERIOD	3,533,146	7,824,196
SUPPLEMENTAL SCHEDULE OF NON-CASH INVESTING ACTIVITIES:
Change in fair value of marketable securities	(82,543)
Cash paid during the period for:
Interest	2,750
Income taxes	$ 17,000	$ 325,000