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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 3 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Net loss $ (577,000) $ (370,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Provision for doubtful accounts (90,000) 40,000
Depreciation expense 13,000 34,000
Amortization expense 24,000 24,000
Deferred rent   2,000
Unrealized gain on investments   (20,000)
Stock option compensation expense 56,000  
Changes in operating assets and liabilities    
Accounts receivable (354,000) 171,000
Inventories (377,000) (25,000)
Prepaid expenses and other (547,000) (147,000)
Accounts payable (70,000) (168,000)
Accrued expenses (217,000) (132,000)
Unearned warranty revenue   (9,000)
Customer deposits 1,370,000 (249,000)
Net cash used in operating activities (769,000) (849,000)
Cash flows from financing activities    
Net proceeds from initial public offering 12,360,000  
Borrowings on notes payable   14,000
Payments on notes payable (1,241,000)  
Payments on line of credit (590,000) (60,000)
Proceeds from private placement   784,000
Net cash provided by financing activities 10,529,000 738,000
Net increase (decrease) in cash and cash equivalents 9,760,000 (111,000)
Cash and cash equivalents, beginning of the period 1,270,000 1,059,000
Cash and cash equivalents, end of the period 11,030,000 948,000
Non-cash investing and financing activities:    
Deferred IPO costs   121,000
Reclassification of IPO related costs from other assets to equity 1,116,000  
Cash paid during the period:    
Interest $ 38,000 $ 83,000