Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Operating activities:
Net income	$ 4,000	$ 191,800
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	99,300	95,600
Deferred income taxe (benefit)	2,000	(9,900)
Stock-based compensation	1,000	4,900
Changes in operating assets and liabilities:
Accounts receivable	(40,100)	614,400
Inventories	(315,600)	(105,300)
Prepaid expenses and other current assets	20,000	12,500
Accounts payable	112,900	(113,300)
Customer advances	326,900	190,000
Accrued expenses and taxes	(23,200)	(12,400)
Total adjustments	183,200	676,500
Net cash provided by operating activities	187,200	868,300
Investing activities:
Additional consideration for acquisition of Altamira Instruments, Inc.	0	(139,900)
Intangible assets acquired in acquisition (note 3)	(260,000)	0
Purchase of investment securities, available for sale	(5,500)	(6,700)
Capital expenditures	(61,900)	(54,900)
Purchase of intangible assets, other	(1,600)	(8,600)
Net cash used in investing activities	(329,000)	(210,100)
Financing activities:
Line of credit proceeds	60,000	0
Proceeds from exercise of stock options	9,600	0
Cash dividend declared and paid	(59,900)	(107,700)
Principal payments on note payable	(12,200)	0
Net cash used in financing activities	(2,500)	(107,700)
Net increase (decrease) in cash and cash equivalents	(144,300)	550,500
Cash and cash equivalents, beginning of year	907,800	632,700
Cash and cash equivalents, end of year	763,500	1,183,200
Supplemental disclosures of cash flow information:
Cash paid for income taxes	3,300	164,000
Non-cash investing and financing activities:
Fair value of stock issued for acquisition	400,000	0
Fair value of note payable issued for acquisition	230,000	0
Fair value of contingent consideration payable in connection with acquisition	$ 128,000	$ 0