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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
Capital Stock [Member]
Retained earnings [Member]
Accumulated other comprehensive income (loss) [Member]
Total
Balance at Dec. 31, 2018 $ 29,715,000 $ 64,937,000 $ (1,095,000) $ 93,557,000
Balance, shares at Dec. 31, 2018 3,759,426      
Net income   2,802,000   2,802,000
Other comprehensive income     1,991,000 1,991,000
Effect of adopting ASU   (107,000)   (107,000)
Issuance of common stock through Employee Stock Purchase Plan $ 175,000     175,000
Issuance of common stock through Employee Stock Purchase Plan, shares 4,535      
Issuance of common stock from vested restricted share grants through stock compensation plans, shares 15,049      
Issuance of common stock through exercise of SSARs, shares 1,965      
Stock-based compensation expense $ 314,000     314,000
Cash dividends declared   (990,000)   (990,000)
Balance at Mar. 31, 2019 $ 30,204,000 66,642,000 896,000 97,742,000
Balance, shares at Mar. 31, 2019 3,780,975      
Balance at Dec. 31, 2018 $ 29,715,000 64,937,000 (1,095,000) 93,557,000
Balance, shares at Dec. 31, 2018 3,759,426      
Balance at Dec. 31, 2019 $ 30,848,000 72,385,000 3,602,000 106,835,000
Balance, shares at Dec. 31, 2019 3,781,500      
Net income   2,634,000   2,634,000
Other comprehensive income     3,248,000 3,248,000
Issuance of common stock through Employee Stock Purchase Plan $ 219,000     219,000
Issuance of common stock through Employee Stock Purchase Plan, shares 3,885      
Issuance of common stock from vested restricted share grants through stock compensation plans $ 12,261      
Stock-based compensation expense 275,000     275,000
Cash dividends declared   (1,071,000)   (1,071,000)
Balance at Mar. 31, 2020 $ 31,342,000 $ 73,948,000 $ 6,850,000 $ 112,140,000
Balance, shares at Mar. 31, 2020 3,797,646