CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)	6 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Operating activities:
Net income	$ 76,200	$ 4,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Loss on sale of investments	4,800
Depreciation and amortization	89,000	99,300
Deferred income taxes	9,500	2,000
Stock-based compensation	6,700	1,000
Changes in operating assets and liabilities:
Accounts receivable	(319,300)	(40,100)
Inventories	(221,000)	(315,600)
Prepaid expenses and other current assets	81,600	20,000
Accounts payable	27,500	112,900
Customer advances	257,900	326,900
Accrued expenses and taxes	(15,700)	(23,200)
Other assets	1,600
Total adjustments	(77,400)	183,200
Net cash provided by (used in) operating activities	(1,200)	187,200
Investing activities:
Intangible assets acquired in acquisition		(260,000)
Purchase of investment securities, available for sale	(710,300)	(5,500)
Capital expenditures	(25,200)	(61,900)
Purchase of intangible assets, other	(2,100)	(1,600)
Redemption of investment securities, available for sale	717,600
Net cash used in investing activities	(20,000)	(329,000)
Financing activities:
Line of credit proceeds		60,000
Proceeds from exercise of stock options		9,600
Cash dividend declared and paid	(40,100)	(59,900)
Principal payments on note payable	(37,600)	(12,200)
Net cash used in financing activities	(77,700)	(2,500)
Net decrease in cash and cash equivalents	(98,900)	(144,300)
Cash and cash equivalents, beginning of year	769,300	907,800
Cash and cash equivalents, end of period	670,400	763,500
Supplemental disclosures
Cash paid during the period for: income taxes		3,300
Cash paid during the period for: interest	$ 2,700