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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities:    
Net loss $ (49) $ (1,221)
Adjustments to reconcile net loss to net cash used in operating activities:    
Provision for (reversal of) doubtful accounts (17) (40)
Depreciation expense 3 13
Amortization expense 48 48
Unrealized gain on investments (129)  
Realized loss on investments 133  
Cash expended in excess of rent expense (4)  
Stock compensation expense   118
Changes in operating assets and liabilities    
Accounts receivable 360 (164)
Inventories (694) (1,964)
Prepaid expenses and other 597 (653)
Accounts payable 44 (703)
Accrued expenses (125) (302)
Unearned warranty revenue 41 (2)
Customer deposits (913) 2,025
Net cash used in operating activities (705) (2,845)
Cash flows from investing activities    
Sales of marketable securities 4,088  
Purchase of marketable securities (4,144)  
Purchases of property, plant and equipment (4) (2)
Net cash used in investing activities (60) (2)
Cash flows from financing activities    
Net Proceeds from initial public offering   12,360
Payments on line of credit   (590)
Payments on notes payable   (1,241)
Net cash provided by financing activities   10,529
Net increase (decrease) in cash and cash equivalents (765) 7,682
Cash and cash equivalents, beginning of the period 2,340 1,270
Cash and cash equivalents, end of the period 1,575 8,952
Non-cash investing and financing activities:    
Reclassification of IPO related costs from other assets to equity   1,116
Accrued expenses settled by issuance of common stock 153  
Right-of-use asset recorded upon adoption of ASC 842 $ 681  
Cash paid during the period:    
Interest   $ 38