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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2019
Jun. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Operating Activities:                    
Net income $ 1,504,077 $ 620,327 $ 638,041 $ 1,045,940 $ 2,425,979 $ 2,862,831        
Adjustments to reconcile net income to net cash provided by operating activities:                    
Depreciation and amortization         620,060 623,317        
Warranty provision         2,396 62,689        
Inventory obsolescence         168,262 121,035        
Share-based compensation         775,642 563,386        
Deferred income taxes         742,490 675,457        
Amortization of operating lease right of use asset         445,692        
Changes in operating assets and liabilities:                    
Accounts receivable, net         (2,721,719) (4,029,608)        
Inventories, net         (1,667,264) 200,306        
Prepaid expenses and other         731,501 2,447,870        
Accounts payable         2,039,811 (2,267,016)        
Accrued and other liabilities         147,740 1,153,067        
Net cash provided by operating activities         3,710,590 2,413,334        
Investing Activities:                    
Purchases of marketable securities         (5,496,651) (3,290,667)        
Proceeds from maturities of marketable securities         3,182,989 3,624,338        
Capital expenditures         (111,602) (303,912)        
Net cash (used in) provided by investing activities         (2,425,264) 29,759        
Financing Activities:                    
Proceeds from exercise of stock options         996,891 54,621        
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 provided by (used in) financing activities         540,525 (2,133,445)        
Effect of foreign exchange rate on cash         (8,910) (21,443)        
Net increase in cash, cash equivalents, and restricted cash         1,816,941 288,205        
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 21,333,859   12,094,279   21,333,859 12,094,279 19,516,918      
Cash and cash equivalents               $ 20,667,934 $ 18,819,078 $ 11,290,068
Restricted cash, current portion               270,604   369,551
Long-term restricted cash               395,321   434,660
Total cash, cash equivalents and restricted cash shown in the consolidated statement of cash flows $ 21,333,859 $ 19,516,918 $ 12,094,279 $ 11,806,074 21,333,859 12,094,279 $ 11,806,074 $ 21,333,859 $ 19,516,918 $ 12,094,279
Supplemental disclosures of cash flow information:                    
Interest paid         2,860        
Noncash investing and financing activities:                    
Change in unrealized gain (loss) on marketable securities         (3,064) 19,102        
Initial measurement of operating lease ROU assets         5,823,972        
Initial measurement of operating lease liabilities         $ 7,814,701