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Deferred drydock costs
 12 Months Ended
Dec. 31, 2011
Deferred Drydock Costs Disclosure [Abstract]  
Deferred drydock costs
Note 4.  Deferred drydock costs

Drydocking activity for the three years ended December 31, 2011 is summarized as follows:

 
 
2011
 
 
2010
 
 
2009
 
 
 
 
 
 
 
 
 
 
 
Balance at January 1
 
$
4,217,071
 
 
$
5,266,289
 
 
$
3,737,386
 
Payments for drydocking
 
 
2,809,406
   
 
2,827,534
 
 
 
4,477,244
 
Drydock amortization
 
 
(3,196,984)
   
 
(3,441,583)
 
 
 
(2,948,341)
 
Amount expensed upon sale of vessel
 
 
(526,130)
 
 
 
(435,169)
 
 
 
-
 
                         
Balance at December 31
 
$
3,303,363
 
 
$
4,217,071
 
 
$
5,266,289