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Accounts Receivable and Advances on Contracts in Progress (Tables)
 12 Months Ended
Dec. 31, 2012
Accounts Receivable and Advances on Contracts in Progress [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Net accounts receivable, trade consists of the following at December 31:

(in thousands)
2012
 
2011
Amounts billed
$
1,927

 
$
3,327

Accrued revenue
238

 
177

 
2,165

 
3,504

Less:  Allowance for doubtful accounts
(28
)
 
(40
)
Net accounts receivable - trade
$
2,137

 
$
3,464

Advances on contracts in progress
$
1,037

 
$
2,232