Note 6 - Commitments and Contingencies (Details Textual) - USD ($) |
9 Months Ended | |
|---|---|---|
Mar. 31, 2016 |
Jun. 30, 2015 |
|
| 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 | 5,000,000 | |
| Day et al. v. Celadon Trucking Services, Inc. [Member] | Minimum [Member] | ||
| Loss Contingency, Estimate of Possible Loss | 0 | |
| Day et al. v. Celadon Trucking Services, Inc. [Member] | Maximum [Member] | ||
| Loss Contingency, Estimate of Possible Loss | 2,000,000 | |
| Capital Addition Purchase Commitments [Member] | ||
| Long-term Purchase Commitment, Amount | $ 7,100,000 | |
| Held In Trust [Member] | ||
| Treasury Stock, Shares | 500,000 | |
| Long-term Purchase Commitment, Amount | $ 41,000,000 | |
| Letters of Credit Outstanding, Amount | $ 3,800,000 | |
| Treasury Stock, Shares | 500,000 | 500,000 |