Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 417,013	$ 168,149
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Gain on sale of assets	(1,744)
Change in accounts receivable and inventory reserves	(66,703)	15,333
Depreciation and amortization	104,007	53,916
Change in cash surrender value of life insurance	(17,001)	(17,001)
Warranty reserve	42,117	31,672
Compensation expense related to stock options		1,469
Change in operating assets and liabilities:
Accounts receivable	(1,525,412)	5,009,964
Notes receivable and other non-trade receivables	194,504	42,130
Inventories	1,258,538	(1,615,368)
Prepaid expenses and other	197,511	228,922
Accounts payable	(1,196,879)	(2,340,371)
Accrued expenses	102,987	(78,837)
Income taxes receivable/ payable	141,974	(519,243)
Total adjustments	(766,101)	812,586
Net cash (used in) provided by operating activities	(349,088)	980,735
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sale of investments		51,035
Proceeds from sale of assets	3,500
Capital expenditures	(130,494)	(395,407)
Net cash used in investing activities	(126,994)	(344,372)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payment of cash dividend	(611,571)	(611,571)
Payment on capital leases		(3,236)
Proceeds from exercise of stock options		124,350
Net cash used in financing activities	(611,571)	(490,457)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(1,087,653)	145,906
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	5,814,184	6,515,067
CASH AND CASH EQUIVALENTS AT END OF PERIOD	4,726,531	6,660,973
Cash paid during the period for:
Interest	16,098	227
Income taxes	$ 93,000	$ 614,000