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Note 9 - Long-term Incentive Plan - Activity Pertaining to Phantom and Restricted Common Stock Unit Awards (Details) - Long-Term Incentive Plan [Member] - Phantom and Restricted Units Holders [Member]
3 Months Ended
Mar. 31, 2020
$ / shares
shares
Nonvested, number of units, beginning balance (in shares) | shares 1,068,343
Nonvested, weighted average grant date fair value, beginning balance (in dollars per share) | $ / shares $ 3.42
Granted, number of units (in shares) | shares 600,396
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 0.90
Vested, number of units (in shares) | shares 227,701
Vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 7.15
Forfeited, number of units (in shares) | shares
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares
Nonvested, number of units, ending balance (in shares) | shares 1,441,038
Nonvested, weighted average grant date fair value, ending balance (in dollars per share) | $ / shares $ 2.80