Note 9 - Employee Benefit Plans - Amounts Recognized in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current liabilities:
Accrued benefit liability	$ (597)	$ (471)
Non- current pension liability:
Accrued benefit liability	(47,711)	(46,628)
Accumulated other comprehensive loss	46,248	42,243
Net amount recognized	$ (2,060)	$ (4,856)