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Consolidated Statements of Cash Flows (Unaudited) (USD $) | 6 Months Ended
--- | ---
May 31, 2014 | May 31, 2013
Cash flows from operating activities: |  |
Net income | $ 612,885 | $ 348
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization expense | 191,675 | 206,103
Abandonment of patents | 25,649 | 378,837
Loss on sale of property and equipment | 0 | 44,428
Compensatory element of stock options | 207,843 | 161,841
Provision for doubtful accounts | 374,966 | 223,786
Equity in losses of affiliate | 189,651 | 76,900
Changes in assets and liabilities: |  |
Accounts receivable | (1,134,216) | (98,631)
Notes receivable | 550,782 | 0
Prepaid expenses and other current assets | 69,135 | 57,237
Deposits and other assets, net | 47,628 | 13,000
Accounts payable | (34,801) | 67,544
Accrued expenses | (580,174) | (96,550)
Deferred revenue | (159,266) | 54,553
Net cash provided by operating activities | 361,757 | 1,089,396
Cash flows from investing activities: |  |
Release of restricted cash held in escrow | 764,098 | 70,831
Purchases of property and equipment | (73,532) | (230,369)
Purchases of marketable securities and other investments, net | (102,650) | (12,110)
Investments in patents | 0 | (34,525)
Investment in affiliate | (112,500) | 0
Net cash provided by (used in) investing activities | 475,416 | (206,173)
Cash flows from financing activities: |  |
Treasury stock purchases | (1,407,278) | (667,966)
Proceeds from the exercise of stock options | 48,665 | 11,825
Net cash used in financing activities | (1,358,613) | (656,141)
(Decrease) increase in cash and cash equivalents | (521,440) | 227,082
Cash and cash equivalents - beginning of period | 3,925,156 | 2,677,382
Cash and cash equivalents - end of period | $ 3,403,716 | $ 2,904,464

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_ShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration