Common Stock (Details) - USD ($)		3 Months Ended		6 Months Ended		12 Months Ended	86 Months Ended
	May 04, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Jun. 30, 2021
Employee [Member] | Minimum [Member]
Class of Stock [Line Items]
Restricted shares, vesting period				1 year
Employee [Member] | Maximum [Member]
Class of Stock [Line Items]
Restricted shares, vesting period				4 years
Director [Member]
Class of Stock [Line Items]
Restricted shares, vesting period				12 months
Dividend Reinvestment Plan [Member]
Class of Stock [Line Items]
Shares authorized per plan		330,750		330,750			330,750
2014 Restricted Stock Plan [Member]
Class of Stock [Line Items]
Aggregate shares granted				200,000
Shares granted				117,069
Allocated share-based compensation expense		$ 173,000	$ 96,000	$ 305,000	$ 192,000
Shares forfeited and available for reissuance				0			2,446
Restricted shares vested during period				42,041
Granted shares unvested		72,582		72,582			72,582
Shares forfeited			100
Underwritten Public Offering [Member]
Class of Stock [Line Items]
Number of shares issued	2,990,000
Common stock, price per share	$ 25.00
Net proceeds received after underwriting discount and other estimated offering expenses	$ 70,238,000
Net proceeds of the offering	4,512,000
Proceeds from follow-on common stock public offering	$ 74,750,000			$ 70,238,000
Treasury Stock Repurchase Program [Member]
Class of Stock [Line Items]
Stock repurchase program, authorized amount		$ 15,000,000		$ 15,000,000			$ 15,000,000
Percentage of issued shares based on closing stock price		4.70%		4.70%			4.70%
Stock repurchased during period, shares				98,452		92,652
Stock repurchased at average price per share		$ 19.53		$ 19.53		$ 19.37	$ 19.53