CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating activities:
Net income	$ 17,500	$ 84,211
Adjustments to reconcile net income to net cash provided by operating activities:
(Recovery of) provision for doubtful accounts	(3,653)	705
Depreciation of equipment and leasehold improvements	131,359	123,837
Stock-based compensation expense	83,041	88,523
Deferred income taxes	55,258	66,990
Change in cash surrender value of life insurance	(172,382)	(181,176)
Change in deferred compensation accrual	45,906	38,777
Deferred compensation paid	37,500	37,500
Net changes in operating assets and liabilities (see note 10)	(22,686)	(121,922)
Cash provided by operating activities	96,843	62,445
Investing activities:
Purchase of equipment and leasehold improvements	(157,242)	(206,309)
Life insurance premiums paid	(130,736)	(131,608)
Cash (used in) investing activities	(287,978)	(337,917)
Financing activities:
Net (decrease) in cash and cash equivalents	(191,135)	(275,472)
Cash and cash equivalents at beginning of period	432,283	735,393
Cash and cash equivalents at end of period	$ 241,148	$ 459,921