Stock-based Compensation - Phantom Stock Plan (Details)	6 Months Ended
	Jun. 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	8,024
Granted (in dollars per share) | $ / shares	$ 15.84
Distributions (in shares) | shares	(628)
Distributions (in dollars per share) | $ / shares	$ 12.24
Outstanding, ending balance (in shares) | shares	116,622
Outstanding, ending (in dollars per share) | $ / shares	$ 11.52
Vested at March 31, 2020 (in shares) | shares	116,243
Vested at March 31, 2020 (in dollars per share) | $ / shares	$ 11.52