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Condensed Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities:    
Net income (loss) $ (1,938,000) $ 998,000
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Depreciation 242,000 268,000
Loss on disposal of property and equipment 11,000  
Amortization 322,000 328,000
Amortization of premium (discounts) on investments, net 27,000 (185,000)
Stock-based compensation 1,322,000 1,056,000
Deferred tax liability (22,000) (8,000)
Changes in operating assets and liabilities:    
Trade accounts receivable 3,069,000 (2,709,000)
Inventory 322,000 256,000
Prepaid expenses and other assets 188,000 (41,000)
Accounts payable (1,576,000) 1,231,000
Accrued bonus (540,000) (1,168,000)
Accrued liabilities and other (137,000) 198,000
Net cash provided by operating activities 1,290,000 224,000
Cash flows from investing activities:    
Purchases of available-for-sale securities (752,000) (21,065,000)
Maturities of available-for-sale securities 15,899,000 20,870,000
Purchases of property and equipment (349,000) (405,000)
Net cash provided by (used in) investing activities 14,798,000 (600,000)
Cash flows from financing activities:    
Repurchases of common stock (608,000) (193,000)
Proceeds from issuance of common stock, net 91,000 589,000
Net cash provided by (used in) financing activities (517,000) 396,000
Net increase in cash, cash equivalents and restricted cash 15,571,000 20,000
Cash, cash equivalents, and restricted cash; beginning of period 13,197,000 13,621,000
Cash, cash equivalents, and restricted cash; end of period 28,768,000 13,641,000
Supplemental disclosure of cash flow information:    
Taxes paid 59,000 46,000
Supplemental disclosure of non-cash investing and financing activities:    
Accrual of property and equipment   169,000
Cash and cash equivalents 28,593,000 $ 13,641,000
Restricted cash included in other assets $ 175,000