v3.21.2
Statements of Cash Flows - USD ($)
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities    
Net income $ 20,327,380 $ 7,293,066
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 2,301,803 2,421,754
Change in allowance for doubtful accounts 209,612 0
Amortization of discount on investments (7,326) (64,327)
Deferred taxes (187,349) (279,808)
Loss on disposal of assets 0 5,785
Stock-based compensation 1,280,135 773,555
Changes in operating assets and liabilities:    
Accounts receivable (9,150,819) (1,378,033)
Inventories, net (13,115,773) (5,395,558)
Other assets (531,201) 127,773
Accounts payable and accrued expenses 9,776,377 3,151,566
Net cash provided by operating activities 10,902,839 6,655,773
Cash flows from investing activities    
Purchases of property, plant and equipment and intangible assets (2,046,004) (1,806,198)
Purchases of investments (24,808,755) (34,056,930)
Proceeds from maturities of investments 13,255,000 35,822,000
Net cash used in investing activities (13,599,759) (41,128)
Cash flows from financing activities    
Proceeds from issuance of common stock under employee stock purchase plan 383,697 348,776
Tax withholding and proceeds related to exercise of stock options (458,017) 9,564
Tax withholding related to vesting of restricted stock grants (462,115) (176,416)
Repurchase of common stock 0 (428,654)
Net cash used in financing activities (536,435) (246,730)
Increase (Decrease) in cash and cash equivalents (3,233,355) 6,367,915
Cash and cash equivalents, beginning of year 16,449,636 10,081,721
Cash and cash equivalents, end of year 13,216,281 16,449,636
Supplemental disclosures for cash flow information    
Cash paid during the year for income taxes 5,504,985 1,442,079
Non-cash financing activities    
Cashless exercise of stock options $ 1,271,472 $ 97,811

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