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Condensed Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash Flows From Operating Activities    
Net income $ 2,133,000 $ 1,922,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 370,000 368,000
Amortization of finite-life intangible assets 52,000 105,000
Share-based compensation expense 506,000 703,000
Deferred income taxes 32,000 15,000
Changes in operating assets and liabilities:    
Accounts receivable (1,293,000) (2,582,000)
Contract assets (284,000) 98,000
Inventories (264,000) 9,000
Prepaid expenses and other assets 105,000 (519,000)
Income tax receivable, net (270,000) (443,000)
Accounts payable and accrued liabilities (111,000) 550,000
Accrued compensation (660,000) (173,000)
Net cash provided by operating activities 316,000 53,000
Cash Flows From Investing Activities    
Expenditures for property and equipment (1,221,000) (980,000)
Expenditures for finite-life intangible assets (54,000) (86,000)
Net cash used in investing activities (1,275,000) (1,066,000)
Cash Flows From Financing Activities    
Issuance of common stock upon exercise of options 40,000
Taxes paid on net share settlement of stock option exercises (305,000) (70,000)
Repurchase of common stock (153,000) (962,000)
Net cash used in financing activities (418,000) (1,032,000)
Net decrease in cash (1,377,000) (2,045,000)
Cash and cash equivalents    
Beginning of period 8,153,000 11,889,000
End of period 6,776,000 9,844,000
Supplemental Disclosures of Cash Flow Information    
Cash paid for income taxes 655,000 1,003,000
Supplemental Disclosures of Noncash Investing and Financing Activities    
Property and equipment acquisitions in accounts payable 136,000 85,000
Intangible asset acquisitions in accounts payable 6,000 9,000
Lease assets obtained in exchange for new operating lease liabilities 107,000
Demonstration equipment returned to inventory $ 9,000 $ 17,000