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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
OPERATING ACTIVITIES |  |  |
Net income | $ 5,101 | $ 2,776 | $ 6,148
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 2,175 | 2,191 | 2,808
Amortization | 839 | 898 | 912
(Gain) loss on equipment disposals/impaired assets | 0 | (72) | 56
Gain on revaluation of ACT liability | 0 | 0 | (758)
Unrealized holding loss (gain) on marketable securities | 0 | 13 | (21)
Allowance for doubtful accounts | 707 | 26 | 348
Deferred income taxes | 1,252 | (458) | 793
Stock compensation expense | 1,798 | 1,306 | 2,810
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (6,970) | 4,249 | (13,279)
Inventories | 77 | (202) | 504
Prepaid expenses, other current assets and other noncurrent assets | 2,118 | (1,808) | (723)
Accounts payable | (2,968) | 2,327 | 2,914
Accrued liabilities and other noncurrent liabilities | (1,287) | (2,579) | 2,346
Net cash provided by operating activities | 2,842 | 8,667 | 4,858
INVESTING ACTIVITIES |  |  |
Purchases of property, equipment and patents | (1,754) | (2,534) | (2,408)
Proceeds from the sale of equipment | 0 | 0 | 2
Net cash used in investing activities | (1,754) | (2,534) | (2,406)
FINANCING ACTIVITIES |  |  |
Net proceeds (payments) of short-term debt | 1,614 | (1,187) | (1,162)
Proceeds from exercises of stock options | 811 | 0 | 376
Excess tax benefit from exercises of stock options | 67 | 0 | 77
Repurchases of common stock | 0 | (7,889) | (4,111)
Treasury shares withheld | (447) | (39) | 0
Net cash provided by (used in) financing activities | 2,045 | (9,115) | (4,820)
Effect of exchange rate fluctuations on cash | 152 | (794) | 73
Net increase (decrease) in cash and cash equivalents | 3,285 | (3,776) | (2,295)
Cash and cash equivalents at beginning of year | 24,453 | 28,229 | 30,524
Cash and cash equivalents at end of year | 27,738 | 24,453 | 28,229
Non-cash activities: |  |  |
Decrease in contingent consideration payable | 0 | 0 | (758)
Cash paid for: |  |  |
Interest | 56 | 93 | 148
Income taxes paid | $ 2,901 | $ 2,043 | $ 5,187

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