Note 4 - Restricted Cash (Details Textual) - USD ($)
$ in Millions
Sep. 30, 2018
Jun. 30, 2018
|Letters of Credit Outstanding, Amount||$ 6.2||$ 6.2|
|Letter of Credit Issued for Workers Compensation Obligation [Member]|
|Letters of Credit Outstanding, Amount||$ 5.9|
The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.
No definition available.