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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.