CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Operating activities:
Net income	$ 137,200	$ 76,200
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Loss on sale of investments	10,500	4,800
Depreciation and amortization	88,500	89,000
Deferred income taxes	7,200	9,500
Stock-based compensation	10,200	6,700
Changes in operating assets and liabilities:
Accounts receivable	(110,900)	(319,300)
Inventories	(165,600)	(221,000)
Prepaid expenses and other current assets	(25,300)	81,600
Other assets	0	1,600
Accounts payable	(5,700)	27,500
Customer advances	194,800	257,900
Accrued expenses and taxes	(94,100)	(15,700)
Total adjustments	(90,400)	(77,400)
Net cash provided by (used in) operating activities	46,800	(1,200)
Investing activities:
Purchase of investment securities, available for sale	(24,300)	(710,300)
Capital expenditures	(24,600)	(25,200)
Purchases of intangible assets	(1,900)	(2,100)
Redemption of investment securities, available for sale	275,300	717,600
Net cash provided by (used in) investing activities	224,500	(20,000)
Financing activities:
Line of credit proceeds	50,000	0
Proceeds from exercise of stock options	6,700	0
Cash dividend declared and paid	(107,400)	(40,100)
Principal payments on note payable	(38,900)	(37,600)
Net cash used in financing activities	(89,600)	(77,700)
Net increase (decrease) in cash and cash equivalents	181,700	(98,900)
Cash and cash equivalents, beginning of year	927,300	769,300
Cash and cash equivalents, end of period	1,109,000	670,400
Cash paid during the period for:
Income Taxes	100,000	0
Interest	$ 1,800	$ 2,700