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Note 3 - Fair Value Measurements - Fair Value and Carrying Value of the Notes (Details) - Senior Notes [Member] - USD ($)
$ in Thousands
Sep. 30, 2019
Mar. 31, 2019
Reported Value Measurement [Member]    
Notes $ 137,682
Estimate of Fair Value Measurement [Member]    
Notes  
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Notes $ 184,575