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RESTATEMENT OF PREVIOUSLY ISSUED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS - Cash flows (Details) - 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  
Net payments on notes payable (1,241,000)  
Net borrowings on notes payable   14,000
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
Restatement Of Companys Financial Statements [Member]    
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  
Net payments on notes payable (1,241,000)  
Net borrowings on notes payable   14,000
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
As Previously Reported | Restatement Of Companys Financial Statements [Member]    
Cash flows from operating activities:    
Net loss (576,000) (389,000)
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
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 (554,000) (148,000)
Accounts payable (70,000) (167,000)
Accrued expenses (219,000) (133,000)
Unearned warranty revenue   (9,000)
Customer deposits 1,370,000 (249,000)
Net cash used in operating activities (777,000) (849,000)
Cash flows from investing activities    
Cash acquired in business combination 8,000  
Cash flows from financing activities    
Cash acquired through Exchange Agreement 8,000  
Net proceeds from initial public offering 12,360,000  
Net payments on notes payable (1,241,000)  
Net borrowings on notes payable   14,000
Payments on line of credit (590,000) (60,000)
Proceeds from private placement   784,000
Net cash provided by financing activities 10,537,000 738,000
Net increase (decrease) in cash and cash equivalents 9,760,000 (111,000)
Cash and cash equivalents, beginning of the period 1,269,000 1,058,000
Cash and cash equivalents, end of the period 11,029,000 947,000
Adjustment | Restatement Of Companys Financial Statements [Member]    
Cash flows from operating activities:    
Net loss (1,000) 19,000
Adjustments to reconcile net loss to net cash used in operating activities:    
Unrealized gain on investments   (20,000)
Changes in operating assets and liabilities    
Prepaid expenses and other 7,000 1,000
Accounts payable   (1,000)
Accrued expenses 2,000 1,000
Net cash used in operating activities 8,000  
Cash flows from investing activities    
Cash acquired in business combination (8,000)  
Cash flows from financing activities    
Cash acquired through Exchange Agreement (8,000)  
Net cash provided by financing activities (8,000)  
Cash and cash equivalents, beginning of the period 1,000 1,000
Cash and cash equivalents, end of the period $ 1,000 $ 1,000