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v3.10.0.1

Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Cash flows from operating activities: |  |  |
Net income | $ 4,274,547 | $ 3,847,839 | $ 8,013,062
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Depreciation and amortization | 2,047,746 | 1,622,094 | 1,449,202
Impairment of long-lived assets | 0 | 643,604 | 0
Deferred income taxes | (339,141) | 32,297 | 2,340,771
(Gain) loss on disposal of assets | (17,691) | 35,281 | 12,348
Stock-based compensation expense | 2,003,207 | 2,319,975 | 1,404,899
Changes in operating assets and liabilities, net of business acquisition: |  |  |
Accounts receivable | (5,583,617) | 761,569 | (1,988,310)
Inventories | 1,183,998 | (80,412) | (1,190,301)
Prepaid expenses and other current assets | 254,501 | 180,456 | (812,811)
Accounts payable and accrued expenses | 723,990 | (3,064,650) | 2,323,891
Net cash provided by operating activities | 4,547,540 | 6,298,053 | 11,552,751
Cash flows from investing activities: |  |  |
Business acquisition | (10,350,000) |  |
Purchases of property, plant and equipment | (1,066,284) | (1,951,615) | (1,550,128)
Purchase of investments | (7,283,075) | (17,630,075) | (8,138,075)
Proceeds from sale of property and equipment | 83,052 | 5,100 | 729
Patent additions | (123,569) | (69,936) | (77,138)
Sale of investments | 6,132,000 | 8,107,000 | 8,123,000
Net cash used in investing activities | (12,607,876) | (11,539,526) | (1,641,612)
Cash flows from financing activities: |  |  |
Repurchase of common stock | (1,760,442) | (3,647,314) | (333,761)
Proceeds from issuance of common stock under employee stock purchase plan | 297,860 | 334,692 | 254,426
Proceeds from issuance of common stock | 24,012 | 28,717 | 548,844
Tax withholding related to vesting of restricted stock grants and exercise of stock options | (489,428) | (952,832) | (437,537)
Net cash (used in) provided by financing activities | (1,927,998) | (4,236,737) | 31,972
(Decrease) increase in cash and cash equivalents | (9,988,334) | (9,478,210) | 9,943,111
Cash and cash equivalents at beginning of year | 18,536,111 | 28,014,321 | 18,071,210
Cash and cash equivalents at end of year | 8,547,777 | 18,536,111 | 28,014,321
Supplemental cash flow information |  |  |
Cash paid during the year for income taxes, net of refunds | 719,694 | 1,471,203 | 1,130,930
Non-cash financing activities |  |  |
Cashless exercise of stock options | 5,782 | 34,268 | 853,033
Establishment of deferred tax asset for the adoption of ASU 2016-09 |  |  | $ 1,864,980

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + 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=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_ShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration