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Cash Equivalents And Restricted Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
Cash Equivalents And Restricted Securities [Abstract] |
Summary Of Cash Equivalents And Restricted Securities |
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  | Unrealized |  | Estimated
﻿ |  |  |  | Holding |  | Market
﻿December 31, 2017 | Cost Basis |  | Gains (Losses) |  | Value
﻿Cash equivalents: |  |  |  |  |  |  |  |
﻿Money market funds | $ | 372 |  |  | -- |  | $ | 372
﻿Restricted securities: |  |  |  |  |  |  |  |
﻿Money market funds |  | 776 |  |  | -- |  |  | 776
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  | Unrealized |  | Estimated
﻿ |  |  |  | Holding |  | Market
﻿December 31, 2016 | Cost Basis |  | Gains (Losses) |  | Value
﻿Cash equivalents: |  |  |  |  |  |  |  |
﻿Money market funds | $ | 3,466 |  | $ | -- |  | $ | 3,466
﻿Restricted securities: |  |  |  |  |  |  |  |
﻿Money market funds |  | 699 |  |  | -- |  |  | 699
﻿ |  |  |  |  |  |  |  |
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- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
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