Note 14 - Liquidity (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Mar. 31, 2021
Working Capital (Deficit)	$ 14.4	$ 20.3
Letters of Credit Outstanding, Amount	29.7	29.7
Lenders [Member]
Letters of Credit Outstanding, Amount		29.7
Line of Credit Facility, Remaining Borrowing Capacity		69.8
Repayments of Debt and Lease Obligation	$ 200.0
Long-term Line of Credit, Total		10.5
Triumph Bank [Member]
Line of Credit Facility, Remaining Borrowing Capacity		$ 9.6