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Note 2 - Basis of Presentation and Significant Accounting Policies (Details Textual)
$ in Thousands
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Number of Wholly Owned Subsidiaries 7    
Cash and Cash Equivalents, at Carrying Value, Ending Balance $ 19,584 $ 23,319 $ 17,092
Restricted Cash, Current 295 282  
Restricted Cash, Noncurrent 1,180 $ 395  
Immaterial Correction of Prior Period Financial Statements [Member]      
Prepaid Expenses and Accrued Liabilities $ 5,205