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Note 13 - Employee and Postretirement Benefit Plans - Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Pension Plan [Member]    
Service cost $ 0 $ 0
Interest cost 28 25
Expected return on plan assets (22) (20)
Amortization of prior service cost 0 0
Recognized net actuarial loss (gain) 20 13
Total net periodic benefit cost 26 18
Other Postretirement Benefits Plan [Member]    
Service cost 33 40
Interest cost 50 51
Expected return on plan assets 0 0
Amortization of prior service cost (31) (30)
Recognized net actuarial loss (gain) (21) 0
Total net periodic benefit cost $ 31 $ 61