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Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Operating activities    
Net income (loss) $ 11,839 $ (225,029)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Stock-based compensation 121,965 112,133
Depreciation and amortization 100,515 91,394
Deferred tax expenses (benefits) 6,670 (79,927)
Changes in operating assets and liabilities:    
Accounts receivable (597,043) (237,731)
Inventories (223,297) (80,982)
Prepaid expenses and other current assets (59,779) 76,255
Accounts payable and accrued expenses 146,882 104,887
Accrued payroll and related expenses 35,033 (91,598)
Net deferred revenue on shipments to distributors 37,131 (57,648)
Deferred service revenue 23,533 4,695
Net change in operating lease (9,550) (5,213)
Net cash used in operating activities (406,101) (388,764)
Investing activities    
Purchases of equipment (100,318) (164,198)
Net cash used in investing activities (100,318) (164,198)
Financing activities    
Payments on finance leases (3,808) (7,089)
Proceeds from borrowings under bank line of credit agreement 4,109,000
Repayments of borrowings under bank line of credit agreement (3,629,494)
Proceeds from bank term loan 4,000,000
Repayments of bank term loan (125,000)
Common stock repurchases and related expenses (5,019,748)
Stock options exercised 275,145
Net cash (used in) provided by financing activities 350,698 (751,692)
Net decrease in cash and cash equivalents (155,721) (1,304,654)
Cash and cash equivalents at beginning of period 1,084,991 3,379,508
Cash and cash equivalents at end of period 929,270 2,074,854
Supplemental disclosure of cash flow information    
Cash paid for interest $ 25,331 $ 353