Note 6 - Commitments and Contingencies (Details Textual) - USD ($) |
3 Months Ended | |
|---|---|---|
Sep. 30, 2016 |
Jun. 30, 2016 |
|
| Wilmoth et al. v. Celadon Trucking Services [Member] | Minimum [Member] | ||
| Loss Contingency, Estimate of Possible Loss | $ 0 | |
| Wilmoth et al. v. Celadon Trucking Services [Member] | Maximum [Member] | ||
| Loss Contingency, Estimate of Possible Loss | 5,900,000 | |
| Day et al. v. Celadon Trucking Services, Inc. [Member] | ||
| Loss Contingency, Estimate of Possible Loss | 2,400,000 | |
| Tractor Operating Leases [Member} | ||
| Long-term Purchase Commitment, Amount | 20,000,000 | |
| Capital Addition Purchase Commitments [Member] | Building [Member] | ||
| Long-term Purchase Commitment, Amount | 23,000,000 | |
| Capital Addition Purchase Commitments [Member] | Land [Member] | ||
| Long-term Purchase Commitment, Amount | $ 26,000,000 | |
| Held In Trust [Member] | ||
| Treasury Stock, Shares | 500,000 | |
| Letters of Credit Outstanding, Amount | $ 5,500,000 | |
| Treasury Stock, Shares | 500,000 | 500,000 |