Long-term Debt, Line of Credit and Derivatives - Financial covenants (Details) $ in Millions	3 Months Ended			9 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Covenant compliance, leverage ratio minimum			6.25
Covenant compliance, EBITDA, minimum				$ 9.9
Scenario, Forecast
Debt Instrument [Line Items]
Covenant compliance, fixed charge coverage ratio, minimum		1.25
Covenant compliance, leverage ratio minimum	3.00	4.00
Covenant compliance, EBITDA, minimum					$ 21.7