Note 4 - Restricted Cash and Restricted Cash Equivalents (Tables)

12 Months Ended

Dec. 31, 2021

The 2021 Bonds [Member]

Notes Tables

Restrictions on Cash and Cash Equivalents [Table Text Block]

Restricted Cash Held by Bond Trustee
Bond proceeds	$	68,995
Disbursement of funds		(44,780	)
Interest paid on bonds		(216	)
Interest income		11
Total restricted cash held by bond trustee		24,010
Total restricted collateral		71,190
Total restricted cash and restricted cash equivalents		95,200
Current portion		(25,032	)
Long-term restricted cash and restricted cash equivalents	$	70,168