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Note 6 - Commitments and Contingencies (Details Textual)
$ in Thousands
Jun. 30, 2019
USD ($)
Estimated Litigation Liability $ 0
Alterwall Business Inc. Vs. Fuel Oil Supplier [Member] | Pending Litigation [Member] | Alterwall Business Inc. [Member]  
Restricted Cash and Investments, Total 530
Estimated Litigation Liability $ 150