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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Mar. 31, 2020
Sep. 30, 2019
Mar. 31, 2019
Operating Activities:                    
Net income $ 301,575 $ 620,327 $ 1,178,850 $ 1,045,940 $ 921,902 $ 2,224,790        
Adjustments to reconcile net income to net cash provided by operating activities:                    
Depreciation and amortization         415,031 417,637        
Warranty provision         (11,053) 44,037        
Inventory obsolescence         127,599 133,259        
Share-based compensation         453,617 305,820        
Deferred income taxes         269,158 557,147        
Amortization of operating lease right of use asset         292,405        
Changes in operating assets and liabilities:                    
Accounts receivable, net         (2,204,894) (3,981,947)        
Inventories, net         (1,214,265) (1,704,919)        
Prepaid expenses and other         787,613 2,518,276        
Accounts payable         1,072,363 (1,847,512)        
Accrued and other liabilities         (3,035,960) 449,152        
Net cash used in operating activities         (2,126,484) (884,260)        
Investing Activities:                    
Purchases of marketable securities         (2,013,441) (2,318,646)        
Proceeds from maturities of marketable securities         1,971,146 2,316,764        
Capital expenditures         (102,126) (299,965)        
Net cash used in investing activities         (144,421) (301,847)        
Financing Activities:                    
Proceeds from exercise of stock options         258,047 45,172        
Repurchase of common stock         (398,256) (2,171,022)        
Shares retained for payment of taxes in connection with settlement of restricted stock units         (41,410)        
Payments on promissory notes         (16,700) (17,044)        
Net cash used in financing activities         (198,319) (2,142,894)        
Effect of foreign exchange rate on cash         11,160 (23,938)        
Net decrease in cash, cash equivalents, and restricted cash         (2,458,064) (3,352,939)        
Cash, cash equivalents and restricted cash, beginning of period   19,516,918   11,806,074 19,516,918 11,806,074 $ 11,806,074      
Cash, cash equivalents and restricted cash, end of period 17,058,854   8,453,135   17,058,854 8,453,135 19,516,918      
Cash and cash equivalents               $ 16,398,928 $ 18,819,078 $ 7,723,503
Restricted cash, current portion               264,633   390,008
Long-term restricted cash               395,293   339,624
Total cash, cash equivalents and restricted cash shown in the consolidated statement of cash flows $ 17,058,854 $ 19,516,918 $ 8,453,135 $ 11,806,074 17,058,854 8,453,135 $ 11,806,074 $ 17,058,854 $ 19,516,918 $ 8,453,135
Supplemental disclosures of cash flow information:                    
Interest paid         2,860        
Noncash investing and financing activities:                    
Change in unrealized gain (loss) on marketable securities         (11,178) 9,620        
Initial measurement of operating lease ROU assets         5,823,972        
Initial measurement of operating lease liabilities         $ 7,814,701