001 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 002 - Statement - Balance Sheets link:presentationLink link:calculationLink link:definitionLink 003 - Statement - Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 004 - Statement - Statements of Comprehensive Income link:presentationLink link:calculationLink link:definitionLink 005 - Statement - Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 101 - Disclosure - Basis of Presentation link:presentationLink link:calculationLink link:definitionLink 102 - Disclosure - Fair Value of Financial Instruments and Investments link:presentationLink link:calculationLink link:definitionLink 103 - Disclosure - Net Income per Share link:presentationLink link:calculationLink link:definitionLink 104 - Disclosure - Stock Based Compensation link:presentationLink link:calculationLink link:definitionLink 105 - Disclosure - Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 106 - Disclosure - Recently Issued Accounting Standards link:presentationLink link:calculationLink link:definitionLink 107 - Disclosure - Employee Stock Ownership Plan link:presentationLink link:calculationLink link:definitionLink 302 - Disclosure - Fair Value of Financial Instruments and Investments (Tables) link:presentationLink link:calculationLink link:definitionLink 304 - Disclosure - Stock Based Compensation (Tables) link:presentationLink link:calculationLink link:definitionLink 307 - Disclosure - Employee Stock Ownership Plan (Tables) link:presentationLink link:calculationLink link:definitionLink 40201 - Disclosure - Fair Value of Financial Instruments and Investments (Schedule of Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Available-For-Sale Securities by Major Security Type) (Details) link:presentationLink link:calculationLink link:definitionLink 40202 - Disclosure - Fair Value of Financial Instruments and Investments (Schedule of Contractual Maturities of Available-For-Sale Securities) (Details) link:presentationLink link:calculationLink link:definitionLink 40401 - Disclosure - Stock-based Compensation (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 8000 - Disclosure - Stock-based Compensation (Schedule of weighted average assumptions for option awards) (Details) link:presentationLink link:calculationLink link:definitionLink 40402 - Disclosure - Stock-based Compensation (Schedule of stock option activity) (Details) link:presentationLink link:calculationLink link:definitionLink 40403 - Disclosure - Stock-based Compensation (Schedule of changes in non-vested stock options) (Details) link:presentationLink link:calculationLink link:definitionLink 40501 - Disclosure - Commitments and Contingencies (Details) link:presentationLink link:calculationLink link:definitionLink 40701 - Disclosure - Employee Stock Ownership Plan (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 40702 - Disclosure - Employee Stock Ownership Plan (Schedule of ESOP shares) (Details) link:presentationLink link:calculationLink link:definitionLink