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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2019 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
Operating Activities: |  |  |  |  |  |
Net income | $ 620,327 | $ 1,045,940 |  |  |  |
Adjustments to reconcile net income to net cash used in operating activities |  |  |  |  |  |
Depreciation and amortization | 208,537 | 201,267 |  |  |  |
Warranty provision | (19,516) | 20,618 |  |  |  |
Inventory obsolescence | 94,415 | 54,854 |  |  |  |
Share-based compensation | 158,327 | 133,845 |  |  |  |
Deferred income taxes | 172,390 | 283,003 |  |  |  |
Amortization of operating lease right of use asset | 145,382 |  |  |  |  |
Changes in operating assets and liabilities: |  |  |  |  |  |
Accounts receivable, net | (2,286,618) | (5,916,242) |  |  |  |
Inventories, net | (320,998) | (2,029,403) |  |  |  |
Prepaid expenses and other | 760,823 | 2,136,282 |  |  |  |
Accounts payable | 604,134 | (66,849) |  |  |  |
Accrued and other liabilities | (1,918,180) | (957,199) |  |  |  |
Net cash used in operating activities | (1,780,977) | (5,093,884) |  |  |  |
Investing Activities: |  |  |  |  |  |
Purchases of marketable securities | (639,794) | (874,353) |  |  |  |
Proceeds from maturities of marketable securities | 588,749 | 982,834 |  |  |  |
Capital expenditures | (86,159) | (38,813) |  |  |  |
Net cash (used in) provided by investing activities | (137,204) | 69,668 |  |  |  |
Financing Activities: |  |  |  |  |  |
Proceeds from exercise of stock options | 144,214 | 2,528 |  |  |  |
Repurchase of common stock |  | (1,621,022) |  |  |  |
Net cash provided by (used in) financing activities | 144,214 | (1,618,494) |  |  |  |
Effect of foreign exchange rate on cash | 14,336 | (9,734) |  |  |  |
Net decrease in cash, cash equivalents, and restricted cash | (1,759,631) | (6,652,444) |  |  |  |
Cash, cash equivalents and restricted cash, beginning of period | 19,516,918 | 11,806,074 | $ 11,806,074 |  |  |
Cash, cash equivalents and restricted cash, end of period | 17,757,287 | 5,153,630 | 19,516,918 |  |  |
Cash and cash equivalents |  |  |  | $ 17,092,203 | $ 18,819,078 | $ 4,416,106
Restricted cash, current portion |  |  |  | 269,830 |  | 397,933
Long-term restricted cash |  |  |  | 395,254 |  | 339,591
Total cash, cash equivalents and restricted cash shown in the consolidated statement of cash flows | 17,757,287 | 5,153,630 | $ 11,806,074 | $ 17,757,287 | $ 19,516,918 | $ 5,153,630
Noncash investing and financing activities: |  |  |  |  |  |
Change in unrealized loss on marketable securities | (3,486) | (613) |  |  |  |
Initial measurement of operating lease right of use assets and liabilities | $ 7,814,701 |  |  |  |  |

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- Definition Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6812-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3044-108585 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=116631420&loc=SL116631458-115580 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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