Condensed Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Cash Flows From Operating Activities
Net income	$ 1,058,000	$ 1,277,000
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation	272,000	221,000
Amortization of finite-life intangible assets	47,000	79,000
Share-based compensation expense	316,000	526,000
Deferred income taxes	10,000	37,000
Changes in operating assets and liabilities:
Accounts receivable	(503,000)	(2,082,000)
Contract assets	(221,000)	111,000
Inventories	(321,000)	334,000
Prepaid expenses and other assets	176,000	(265,000)
Income tax payable, net	79,000	(366,000)
Accounts payable and accrued liabilities	(711,000)	435,000
Accrued compensation	(532,000)	(413,000)
Net cash used in operating activities	(330,000)	(106,000)
Cash Flows From Investing Activities
Expenditures for property and equipment	(687,000)	(511,000)
Expenditures for finite-life intangible assets	(30,000)	(69,000)
Net cash used in investing activities	(717,000)	(580,000)
Cash Flows From Financing Activities
Issuance of common stock upon exercise of options	16,000
Taxes paid on net share settlement of stock option exercises	(60,000)	(70,000)
Repurchase of common stock	(153,000)	(663,000)
Net cash used in financing activities	(197,000)	(733,000)
Net decrease in cash	(1,244,000)	(1,419,000)
Cash and cash equivalents
Beginning of period	8,153,000	11,889,000
End of period	6,909,000	10,470,000
Supplemental Disclosures of Cash Flow Information
Cash paid for income taxes	182,000	681,000
Supplemental Disclosures of Noncash Investing and Financing Activities
Property and equipment acquisitions in accounts payable	73,000	153,000
Intangible asset acquisitions in accounts payable	5,000	6,000
Lease assets obtained in exchange for new operating lease liabilities		53,000
Demonstration equipment returned to inventory	$ 26,000	$ 10,000