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Note 1 - Basis of Presentation (Details Textual) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Increase (Decrease) in Contract with Customer, Liability $ 25 $ 872
Increase (Decrease) in Accrued Liabilities, Total $ 689 157
Restatement Adjustment [Member]    
Increase (Decrease) in Contract with Customer, Liability   (574)
Increase (Decrease) in Accrued Liabilities, Total   $ (574)