Note 8 - Employee Benefit Plans - Amounts Recognized in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current liabilities:
Accrued benefit liability	$ (622)	$ (597)
Non- current pension liability:
Accrued benefit liability	(56,219)	(47,711)
Accumulated other comprehensive loss	49,525	46,248
Net amount recognized	$ (7,316)	$ (2,060)