4. Net Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Net Earnings
Basic earnings per share	$ 3,667	$ 3,303
Effect of dilutive securities: Restricted stock units	0	0
Diluted earnings per share	$ 3,667	$ 3,303
Weighted Average Number of Shares
Basic earnings per share (in shares)	5,996,488	5,995,256
Effect of dilutive securities: Restricted stock units (in shares)	24,369	17,000
Diluted earnings per share (in shares)	6,020,857	6,012,256
Per Share Amount
Basic earnings per share	$ 0.61	$ 0.55
Diluted earnings per share	$ 0.61	$ 0.55

Earnings Per Share, Per Share Amount, Reconciliation [Abstract]

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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