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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 3 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:    
Net profit/(loss) $ 439,000 $ (95,000)
Adjustments to reconcile net profit/(loss) to net cash provided by (used in) operating activities:    
Provision for doubtful accounts 1,000 3,000
Depreciation expense 2,500 2,000
Amortization expense 14,000 24,000
ROU amortization 66,000 (5,000)
Stock option compensation expense 5,000  
Unrealized loss on investments   140,000
Realized loss on investments   23,000
Changes in operating assets and liabilities    
Accounts receivable (1,138,000) 9,000
Inventories, net (333,000) (887,000)
Prepaid expenses and other 203,000 425,000
Accounts payable 1,405,000 1,597,000
Accrued expenses 225,000 28,000
Unearned warranty revenue (14,000) 28,000
Customer deposits (1,016,000) (1,312,000)
Lease liabilities (67,000)  
Net cash used in operating activities (207,000) (20,000)
Cash flows from investing activities    
Sales of marketable securities   493,000
Purchases of marketable securities   (517,000)
Purchases of property and equipment (1,000) (2,000)
Net cash used in investing activities (1,000) (26,000)
Net decrease in cash (208,000) (46,000)
Cash, beginning of the year 6,616,000 2,340,000
Cash, end of the year $ 6,408,000 2,294,000
Non-cash investing and financing activities:    
Issuance of stock to employees   153,000
Right-of-use assets from ASC842 adoption   $ 681,000