Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Restricted Cash and Investments

Note 4 - Restricted Cash and Investments
9 Months Ended
Mar. 31, 2018
Notes to Financial Statements  
Restricted Assets Disclosure [Text Block]
Restricted Cash and Investments
March 31, 2018
June 30, 2017,
we held
million and
million respectively, of restricted cash and investments in lieu of providing letters of credit for the benefit of the provider of our workmen’s compensation insurance and other insurance. These funds can be invested in high quality money market mutual funds, U.S. Treasuries and U.S. Government agency fixed income instruments, and cannot be withdrawn without the prior written consent of the secured party. These assets are carried at cost, which approximates market value and are classified as long-term assets because they are
expected to be used within
year to fund operations. See also Note 
“Financial Instruments".