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Unaudited Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash flows from operating activities:    
Net income $ 1,957 $ 5,508
Adjustments to reconcile net income to cash provided by operations:    
Depreciation and amortization expense 1,166 872
Stock-based compensation 176 130
Provision for doubtful accounts 6 199
Increase (decrease) in reserves against inventories 278 (166)
Loss on disposal of assets 0 4
Proceeds from litigation 0 (3,702)
Changes in operating assets and liabilities:    
Accounts receivable 784 1,179
Inventories 88 (1,750)
Deferred income taxes (11) 1,418
Prepaid expenses and other assets 336 (281)
Accounts payable (1,403) (53)
Income taxes payable (1,155) 958
Accrued liabilities 123 (1,768)
Deferred product revenue 141 (602)
Other long-term assets and liabilities 138 88
Net cash provided by operating activities 2,624 2,034
Cash flows from investing activities:    
Payment towards acquisition of VCON business (4,632) 0
Payment towards acquisition of MagicBox business 0 (750)
Purchase of property and equipment (260) (309)
Net cash used in investing activities (4,892) (1,059)
Cash flows from financing activities:    
Proceeds from issuance of common stock - options 301 732
Treasury stock purchased (384) 0
Net cash provided by (used in) financing activities (83) 732
Net increase (decrease) in cash and cash equivalents (2,351) 1,707
Cash and cash equivalents at the beginning of the period 16,683 11,431
Cash and cash equivalents at the end of the period 14,332 13,138
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 1,393 274
Exchanged accounts receivable from a vendor with accounts payable to the same vendor $ 0 $ 182