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Note 1 - Basis of Presentation - Impact to Previously Reported Results (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Other noncurrent assets $ 916 $ 887 [1]
Prepaid expenses and other current assets 2,397 2,368 [1]
Accrued expenses and other current liabilities   3,973
Other noncurrent liabilities 468 408 [1]
Accumulated deficit $ (57,610) (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. Shareholders’ equity as of December 31, 2018 has been adjusted for the effects of the new standard. See Note 1 for further information.