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Note 9 - Legal Proceedings (Details Textual) - USD ($) $ in Millions			1 Months Ended		3 Months Ended
	Oct. 24, 2019	Jan. 11, 2019	Jun. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	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
Arbitration Case with BNSF [Member] | Final Award for Period Of January 1, 2018 Through December 31, 2018 [Member]
Loss Contingency, Loss in Period					$ 26.8
Arbitration Case with BNSF [Member] | Final Award for Period Of January 1, 2018 Through December 31, 2018 [Member] | Subsequent Event [Member]
Loss Contingency, Loss in Period	$ 44.2
Arbitration Case with BNSF [Member] | Final Award for Period Of January 1, 2018 Through December 31, 2018 [Member] | Legal Fees, Cost and Interest [Member] | Subsequent Event [Member]
Loss Contingency, Loss in Period	$ 17.4
Casualty Claim [Member] | Settled Litigation [Member] | DCS [Member]
Loss Contingency, Loss in Period			$ 20.0

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

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