| 4. Acquisition (Tables)
 | 12 Months Ended | 
| Sep. 30, 2018 | 
|---|
| VSAH [Member] |  | 
| Schedule of acquired assets and liabilities | 
    | Cash and cash equivalents |  | $ | 272,590 |  |  
    | Trade and other receivables |  |  | 177,338 |  |  
    | Inventory |  |  | 18,711,192 |  |  
    | Prepaid expenses and other current assets |  |  | 814,201 |  |  
    | Property and equipment |  |  | 4,859,676 |  |  
    | Intangible - leases |  |  | 1,033,412 |  |  
    | Intangible - trade names |  |  | 1,200,000 |  |  
    | Intangible - customer list |  |  | 50,000 |  |  
    | Intangible - customer relationship |  |  | 1,000,000 |  |  
    | Goodwill |  |  | 36,946,735 |  |  
    | Notes payable |  |  | (542,074 | ) |  
    | Accounts payable |  |  | (5,165,612 | ) |  
    | Accrued expenses |  |  | (1,703,760 | ) |  
    |  |  | $ | 57,653,698 |  |  | 
| Pro forma table related to acquisition | 
    |  |  | Year Ended |  |  
    |  |  | September 30, 2017 |  |  
    | Net revenue |  | $ | 76,133,061 |  |  
    | Gross profit |  |  | 43,735,263 |  |  
    | Operating income |  |  | 11,167,940 |  |  
    | Net income |  |  | 5,517,942 |  |  
    | Earnings per basic common share |  | $ | 2.50 |  |  | 
| ApplianceSmart Inc [Member] |  | 
| Schedule of acquired assets and liabilities | 
    | Trade receivables |  | $ | 1,805,545 |  |  
    | Inventory |  |  | 7,444,282 |  |  
    | Prepaid expenses |  |  | 69,347 |  |  
    | Refundable deposits |  |  | 1,003,841 |  |  
    | Intangible asset - trade names |  |  | 2,015,000 |  |  
    | Intangible asset - customer list |  |  | 5,202 |  |  
    | Intangible asset - leases |  |  | 1,205,596 |  |  
    | Restricted cash |  |  | 750,000 |  |  
    | Property and equipment |  |  | 1,094,503 |  |  
    | Deferred income tax |  |  | (1,599,560 | ) |  
    | Bargain gain on acquisition |  |  | (7,293,756 | ) |  
    |  |  | $ | 6,500,000 |  |  | 
| Pro forma table related to acquisition | 
    |  |  | Year Ended |  |  | Year Ended |  |  
    |  |  | September 30, 2018 |  |  | September 30, 2017 |  |  
    | Net revenue |  | $ | 44,138,639 |  |  | $ | 59,112,048 |  |  
    | Gross profit |  |  | 9,301,315 |  |  |  | 16,122,521 |  |  
    | Operating income |  |  | (7,161,319 | ) |  |  | 1,410,022 |  |  
    | Net income |  |  | 637,819 |  |  |  | 676,636 |  |  
    | Earnings per basic common share |  | $ | 0.32 |  |  | $ | 0.31 |  |  | 
| ASH [Member] |  | 
| Schedule of acquired assets and liabilities | 
    | Accounts payable |  | $ | 1,374,647 |  |  
    | Accrued expenses |  |  | 1,080,255 |  |  
    | Capital leases |  |  | 29,631 |  |  
    | Credit card receivables |  |  | (255,301 | ) |  
    | Cash |  |  | (621,863 | ) |  
    | Total net liabilities assumed by ASH |  | $ | 1,607,369 |  |  |