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Stock-based Compensation - Phantom Stock Plan (Details)
 3 Months Ended
Mar. 31, 2020
$ / shares
shares
Note 11 - Stock-based Compensation - Phantom Stock Plan (Details)  
Outstanding, beginning balance (in shares) | shares 109,226
Outstanding, beginning balance (in dollars per share) | $ / shares $ 21.61
Granted (in shares) | shares 5,798
Granted (in dollars per share) | $ / shares $ 17.77
Distributions (in shares) | shares (26)
Distributions (in dollars per share) | $ / shares $ 20.45
Outstanding, ending balance (in shares) | shares 114,998
Outstanding, ending (in dollars per share) | $ / shares $ 13.36
Vested at March 31, 2020 (in shares) | shares 114,627
Vested at March 31, 2020 (in dollars per share) | $ / shares $ 13.36