Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

Shareholders' Equity [Abstract]

Changes in common stock outstanding and additional paid-in capital

Changes in common stock outstanding and additional paid-in capital are as follows:
											Additional
	Class A				Class B						Paid-in
	Shares		Amount		Shares			Amount			Capital
Balance at January 1, 2015		2,623,109	$	112		12,356,389		$	527		$	51,854
Restricted stock grants		-		-		46,552			2			1,092
Balance at December 31, 2015		2,623,109		112		12,402,941			529			52,946
Restricted stock grants		-		-		57,959			3			1,340
Balance at December 31, 2016		2,623,109		112		12,460,900			532			54,286
Restricted stock grants		-		-		47,578			2			1,152
Repurchase of common shares		-		-		(84,960	)		(4	)		(360	)
Balance at December 31, 2017		2,623,109	$	112		12,423,518		$	530		$	55,078