Statements of Cash Flows (USD $)	6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities
Net income	$ 326,123	$ 247,203
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization	285,767	258,803
Deferred income taxes	0	(44,173)
Changes in assets and liabilities
Accounts receivable	(219,747)	(232,024)
Inventories	(39,520)	(36,735)
Prepaid expenses and other	58,461	(7,674)
Accounts payable	16,773	162,243
Accrued expenses	(26,158)	17,319
Income taxes payable (receivable)	151,770	(6,673)
Customer deposits	(2,186)	4,752
Net cash provided by operating activities	551,283	451,387
Cash flows from investing activities
Purchases of property and equipment	(201,780)	(204,557)
Net cash flows used in investing activities	(201,780)	(204,557)
Cash flows from financing activities
Payments on long-term debt and capital leases	(133,872)	(116,085)
Borrowings on long-term obligations	0	18,919
Net cash flows used in financing activities	(133,872)	(97,166)
Net increase (decrease) in cash	215,631	(149,664)
Cash - beginning of period	674,459	480,546
Cash - end of period	890,090	630,210
Supplemental disclosure of cash flow information
Cash paid for interest	109,574	123,837
Cash paid for income taxes	0	94,500
Acquisition of fixed assets through capital lease	$ 0	$ 81,683