CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Operating activities:
Net income (loss)	$ (3,400)	$ 34,300
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Loss on asset disposal	0	2,700
Loss on sale of investments	(2,600)	0
Depreciation and amortization	189,500	210,800
Deferred income tax benefit expense	14,100	(30,000)
Stock-based compensation	1,000	1,200
Changes in operating assets and liabilities:
Accounts receivable	(436,100)	211,600
Inventories	287,100	(1,048,800)
Prepaid expenses and other current assets	(75,300)	13,000
Accounts payable	(42,200)	144,500
Customer advances	17,000	33,700
Accrued expenses and taxes	(399,400)	259,600
Total adjustments	(446,900)	(201,700)
Net cash used in operating activities	(450,300)	(167,400)
Investing activities:
Redemption of investment securities, available-for-sale	11,100	0
Purchase of investment securities, available-for-sale	(18,700)	(2,700)
Capital expenditures	(4,700)	(8,400)
Purchase of other intangible assets	(14,700)	(5,700)
Net cash used in investing activities	(27,000)	(16,800)
Financing activities:
Line of credit proceeds	250,000	470,000
Payments of contingent consideration	(117,400)	(100,900)
Principal payments on note payable	(3,200)	0
Net cash provided by financing activities	129,400	369,100
Net increase (decrease) in cash and cash equivalents	(347,900)	184,900
Cash and cash equivalents, beginning of year	1,245,000	482,000
Cash and cash equivalents, end of period	897,100	666,900
Cash paid during the period for:
Income Taxes	186,000	18,500
Interest	$ 1,100	$ 4,400