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STATEMENTS OF CASH FLOWS (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Operating Activities:    
Net income $ 115,000 $ 420,000
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 266,000 274,000
Stock-based compensation 36,000 77,000
Gain on sale of property and equipment   (12,000)
Changes in operating assets and liabilities:    
Accounts receivable (1,173,000) (2,338,000)
Inventories (100,000) (15,000)
Income tax receivable (1,000) (28,000)
Prepaid expenses and other (10,000) 92,000
Accounts payable (3,000) 496,000
Accrued liabilities (689,000) (770,000)
Income tax payable 119,000 563,000
Deferred revenue 134,000 347,000
Net cash used in operating activities (1,306,000) (894,000)
Investing Activities:    
Purchases of property and equipment (84,000) (16,000)
Proceeds from sale of property and equipment   13,000
Acquisition of selling rights (188,000)  
Net cash used in investing activities (272,000) (3,000)
Financing Activities:    
Proceeds from issuance of common stock 145,000 87,000
Net cash provided by financing activities 145,000 87,000
Decrease in cash and cash equivalents (1,433,000) (810,000)
Cash and cash equivalents at beginning of period 21,763,000 20,271,000
Cash and cash equivalents at end of period 20,330,000 19,461,000
Supplemental disclosures for cash flow information:    
Cash paid during the period for income taxes 22,000 30,000
Non-cash investing activities:    
Acquisition of selling rights in accounts payable $ 62,000