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Note 9 - Legal Proceedings (Details Textual) - USD ($) $ in Millions		1 Months Ended	3 Months Ended
	Jan. 11, 2019	Sep. 30, 2018	Dec. 31, 2018	Sep. 30, 2018
Lawsuit for Claims of Unpaid Wages, Failure to Provide Meal and Rest Periods, and Other Items [Member]
Loss Contingency, Damages Sought, Value		$ 15.0
Arbitration Case with BNSF [Member]
Loss Contingency, Loss in Period				$ 18.3
Arbitration Case with BNSF [Member] | Second Interim Award by Abritrators [Member]
Loss Contingency, Damages Awarded, Value	$ 89.4
Arbitration Case with BNSF [Member] | Second Interim Award by Abritrators for 2016 Period at Issue [Member]
Loss Contingency, Damages Awarded, Value	52.1
Arbitration Case with BNSF [Member] | Second Interim Award by Abritrators for 2017 [Member]
Loss Contingency, Damages Awarded, Value	$ 37.3
Arbitration Case with BNSF [Member] | Interim Award, Contingent Liabilities for Period of May 1, 2016 through December 31, 2017 [Member]
Loss Contingency, Loss in Period			$ 89.4
Arbitration Case with BNSF [Member] | Interim Award, Contingent Liabilities for Period of January 1, 2018 through December 31, 2018 [Member]
Loss Contingency, Loss in Period			44.6
Arbitration Case with BNSF [Member] | Interim Award, Contingent Liabilities for Period of May 1, 2016 through December 31, 2018 [Member]
Loss Contingency, Loss in Period			$ 134.0

X

- Definition

Amount of damages awarded to the plaintiff in the legal matter.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (a)
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- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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