Note 6 - Commitments and Contingencies (Details Textual) - USD ($) |
6 Months Ended | |
|---|---|---|
Dec. 31, 2015 |
Jun. 30, 2015 |
|
| Wilmoth et al. v. Celadon Trucking Services [Member] | ||
| Loss Contingency, Range of Possible Loss, Minimum | $ 0 | |
| Loss Contingency, Range of Possible Loss, Maximum | 5,000,000 | |
| Day et al. v. Celadon Trucking Services, Inc. [Member] | ||
| Loss Contingency, Range of Possible Loss, Minimum | 0 | |
| Loss Contingency, Range of Possible Loss, Maximum | $ 2,000,000 | |
| Held In Trust [Member] | ||
| Treasury Stock, Shares | 500,000 | |
| Long-term Purchase Commitment, Amount | $ 83,500,000 | |
| Letters of Credit Outstanding, Amount | $ 2,200,000 | |
| Treasury Stock, Shares | 500,000 | 500,000 |