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Note 1 - Basis of Presentation - Impact to Previously Reported Results (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Other noncurrent assets | $ 784 | $ 887 | [1]
Prepaid expenses and other current assets | 2,374 | 2,368 | [1]
Accrued expenses and other current liabilities |  | 3,973 |
Other noncurrent liabilities | 377 | 408 | [1]
Accumulated deficit | $ (55,354) | (58,035) | [1]
Previously Reported [Member] |  |  |
Other noncurrent assets |  | 82 |
Prepaid expenses and other current assets |  | 2,429 |
Accrued expenses and other current liabilities |  | 3,534 |
Other noncurrent liabilities |  | 32 |
Accumulated deficit |  | (57,964) |
Restatement Adjustment [Member] | Accounting Standards Update 2016-02 [Member] |  |  |
Other noncurrent assets |  | 805 |
Prepaid expenses and other current assets |  | (61) |
Accrued expenses and other current liabilities |  | 439 |
Other noncurrent liabilities |  | 376 |
Accumulated deficit |  | $ (71) |
[1] | Effective January 1, 2019, the Company adopted Accounting Standards Codification Topic 842 (ASC 842), Leases. Prior period balances have been adjusted for the effects of the new standard. See Note 1 for further information.

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