Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common Stock Voting Common Stock	Common Stock Nonvoting Common Stock	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total
Balance at the beginning at Dec. 31, 2016	$ 207	$ 38	$ 65,777	$ 52,619	$ (3,275)	$ 115,366
Balance at the beginning (in shares) at Dec. 31, 2016	20,744,001	3,845,860
Stock-based Compensation			368			368
Comprehensive Income (Loss)				16,889	4,359	21,248
Stock Options Exercised	$ 1		179			180
Stock Options Exercised (in shares)	90,000
Balance at the end at Dec. 31, 2017	$ 208	$ 38	66,324	69,508	1,084	137,162
Balance at the end (in shares) at Dec. 31, 2017	20,834,001	3,845,860
Stock-based Compensation			799			799
Comprehensive Income (Loss)				26,920	(2,846)	24,074
Issuance of Common Stock, Net of Issuance Costs	$ 54		58,803			58,857
Issuance of Common Stock, Net of Issuance Costs (in shares)	5,379,513
Conversion of Non-voting Stock to Voting Stock	$ 38	$ (38)
Conversion of Non-voting Stock to Voting Stock (in shares)	3,845,860	(3,845,860)
Stock Options Exercised	$ 1		105			$ 106
Stock Options Exercised (in shares)	37,900					37,900
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act to Retained Earnings				(194)	194
Balance at the end at Dec. 31, 2018	$ 301		126,031	96,234	(1,568)	$ 220,998
Balance at the end (in shares) at Dec. 31, 2018	30,097,274
Stock-based Compensation			752			752
Comprehensive Income (Loss)				31,403	6,342	37,745
Stock Options Exercised	$ 1		257			$ 258
Stock Options Exercised (in shares)	74,850					74,850
Stock Repurchases	$ (13)		(14,946)			$ (14,959)
Stock Repurchases (in shares)	(1,331,512)
Issuance of Restricted Stock Awards	$ 1		(1)
Issuance of Restricted Stock Awards (in shares)	132,960
Balance at the end at Dec. 31, 2019	$ 290		$ 112,093	$ 127,637	$ 4,774	$ 244,794
Balance at the end (in shares) at Dec. 31, 2019	28,973,572