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Condensed Statements of Cash Flows (Unaudited) (USD $)
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:  
Net income$ 561,565$ 778,956
Adjustments to reconcile net income to net cash provided by operating activities  
Depreciation299,169304,347
Amortization37,30239,214
Stock based compensation19,50221,952
Gain on sale of equipment and vehicles (10,766)
Loss on intangible asset abandonment 29,918
Changes in working capital components:  
Trade receivables(384,886)(171,507)
Inventories(339,825)(266,205)
Prepaid expenses and other assets(29,605)(33,316)
Accounts payable248,126103,216
Accrued expenses65,148(6,204)
Income taxes payable(10,744)(74,189)
Net cash provided by operating activities465,752715,416
CASH FLOWS FROM INVESTING ACTIVITIES:  
Purchases of property, plant and equipment(465,530)(155,681)
Proceeds from sale of equipment and vehicles 19,200
Purchases of intangibles(54,675)(35,421)
Purchases of short-term investments(2,240,321)(2,216,089)
Proceeds on sale of short-term investments2,425,546807,041
Net cash used in investing activities(334,980)(1,580,950)
CASH FLOWS FROM FINANCING ACTIVITIES:  
Repurchase of common stock(2,079)(15,130)
Proceeds from exercise of stock options69,71035,240
Net cash provided by financing activities67,63120,110
NET INCREASE (DECREASE) IN CASH198,403(845,424)
CASH AT BEGINNING OF PERIOD1,291,3831,304,586
CASH AT END OF PERIOD1,489,786459,162
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION  
Cash paid for income taxes, net of refunds received of $4,090 and $81,422, respectively230,894386,299
SUPPLEMENTAL SCHEDULE OF NONCASH OPERATING AND INVESTING ACTIVITIES  
Equipment transferred from inventory to property, plant and equipment$ 227,039