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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:      
Net income $ 4,103 $ 4,614 $ 4,583
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization 622 640 541
Stock-based compensation 558 689 915
Reversal of reserve for uncertain tax positions   (1,914)  
Gain on sale of patent assets   (43) (2,127)
Amortization of premium (discount) on investments (13) (11) (3)
(Gain)/loss on sale of investments   (12) 59
Deferred tax benefit (expense) on other comprehensive income (24) 18 (66)
Increase (decrease) from changes in assets and liabilities:      
Accounts receivable 1,727 (1,124) 963
Inventories   2 1,599
Prepaid expenses and other current assets 215 (82) 294
Deferred tax assets (79) (27) 173
Accounts payable (99) (24) (1,258)
Accrued expenses 123 132 23
Accrued income taxes (236) 236  
Deferred revenue (3,083) 3,590 560
Net cash provided by operating activities 3,814 6,684 6,256
Cash flows from investing activities:      
Purchases of property and equipment (87) (127) (135)
Sales of investments   529 1,432
Proceeds from sale of patent assets, net   43 2,127
Purchase of other assets   (320)  
Net cash provided by (used in) investing activities (87) 125 3,424
Cash flows from financing activities:      
Proceeds from issuance of common stock 44 40 508
Payment of dividends     (39,905)
Excess tax benefits from stock-based compensation 701 554 1,247
Payments made for taxes of employees who surrendered shares related to unrestricted stock (136) (156) (205)
Repurchase of common stock (3,655)    
Net cash provided by (used in) financing activities (3,046) 438 (38,355)
Increase/(decrease) in cash and cash equivalents 681 7,247 (28,675)
Cash and cash equivalents, beginning of year 51,232 43,985 72,660
Cash and cash equivalents, end of year 51,913 51,232 43,985
Supplemental disclosure:      
Cash paid for income taxes $ 1,553 $ 571 $ 1,018