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Supplementary Data (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Other current assets:    
State income taxes receivable $ 447 $ 889
Other current assets 125 97
Total other current assets 572 986
Current portion of long-term debt and capital lease obligations:    
Long-term Debt 16,996 16,927
Capital leases 324 324
Total current portion of long-term debt and capital lease obligations 17,320 17,251
Other current liabilities:    
Federal income taxes payable 3,542 1,120
Deferred rent 247 241
Total other current liabilities 3,789 1,361
Accrued liabilities:    
Accrued salaries and wages 1,399 2,643
Accrued incentive compensation 2,332 6,412
Accrued vacation 2,672 2,417
Accrued insurance 1,966 1,832
Accrued interest 290 1,271
Accrued ad valorem and franchise taxes 1,080 1,003
Accrued commissions 554 461
Other accrued liabilities 2,104 1,520
Total accrued liabilities 12,397 17,559
Other long-term liabilities:    
Deferred rent 901 966
Incentive compensation 954 1,287
Contingent consideration 964 1,125
Total other long-term liabilities 2,819 3,378
Term Loan [Member] | Credit Agreement [Member]    
Current portion of long-term debt and capital lease obligations:    
Long-term Debt 15,000 15,000
Acquisition Debt, Deferred Purchase Price [Member] | Notes Payable, Other Payables [Member]    
Current portion of long-term debt and capital lease obligations:    
Long-term Debt $ 1,996 $ 1,927