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Stock-based Compensation - Phantom Stock Plan (Details)
 9 Months Ended
Sep. 30, 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 10,392
Granted (in dollars per share) | $ / shares $ 14.58
Distributions (in shares) | shares (890)
Distributions (in dollars per share) | $ / shares $ 11.73
Outstanding, ending balance (in shares) | shares 118,728
Outstanding, ending (in dollars per share) | $ / shares $ 10.52
Vested at September 30, 2020 (in shares) | shares 118,677
Vested at September 30, 2020 (in dollars per share) | $ / shares $ 10.52