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Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Revenue from Contract with Customer $ 42,261 $ 41,516
Revenue from non-contractual arrangements 55 55
Bill and Hold Revenue [Member]    
Revenue from Contract with Customer 9,276 7,549
Non-bill and Hold Revenue [Member]    
Revenue from Contract with Customer 32,985 33,967
Short-Term Contract with Customer [Member]    
Revenue from Contract with Customer 10,142 5,106
Long-Term Contract with Customer [Member]    
Revenue from Contract with Customer $ 32,064 $ 36,355