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Note 1 - Summary of Operations and Significant Accounting Policies - Impact to Previously Reported Results (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Other noncurrent assets $ 1,963 $ 887
Prepaid expenses and other current assets 3,103 2,368
Accrued expenses and other current liabilities   3,973
Other noncurrent liabilities 1,278 408
Accumulated deficit $ (52,830) (58,035)
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)