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Note C - Contract Receivables (Tables)
 12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
 
 
2015
 
 
2014
 
Billed
   $ 159,985     $ 162,876  
Unbilled
     93,131       90,419  
Retainages
     5,486       5,788  
Other
     3,370       3,058  
Allowance for doubtful accounts
     (2,138
)
     (1,887
)
Contract receivables, net
   $ 259,834     $ 260,254