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Note 3 - Revenue From Contracts With Customers - Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2018
Accounts receivable, balance $ 1,552 $ 5,655 $ 5,655
Accounts receivable, additions 10,735 5,422  
Accounts receivable, deductions 9,584 9,525  
Accounts receivable, balance 2,703 1,552 2,703
Unbilled services, balance 7,183 5,904 5,904
Unbilled services, additions 2,465 2,960  
Unbilled services, deductions 1,035 1,681  
Unbilled services, balance 8,613 7,183 8,613
Balance 2,049 2,552 2,552
Customer deposits, additions 3,383  
Customer deposits, deductions 503  
Balance $ 5,432 2,049 5,432
Amounts included in the contract liability balance at the beginning of the period   $ 503