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Revolving credit facility (Details) (USD $)
3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
DEBT        
Interest expense $ 348,000us-gaap_InterestExpense $ 355,000us-gaap_InterestExpense $ 1,070,000us-gaap_InterestExpense $ 1,109,000us-gaap_InterestExpense
Amortization of financing fees     447,000us-gaap_AmortizationOfFinancingCosts 446,000us-gaap_AmortizationOfFinancingCosts
Revolving Credit Facility        
DEBT        
Term of credit facility (in years)     5 years  
Maximum borrowing capacity 180,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
  180,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Revolving credit facility maturity date     Nov. 17, 2016  
Availability to be maintained under credit facility, percentage 10.00%tues_LineOfCreditFacilityCovenantRemainingBorrowingCapacityPercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
  10.00%tues_LineOfCreditFacilityCovenantRemainingBorrowingCapacityPercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Availability to be maintained under credit facility before restriction on investments, percentage 17.50%tues_LineOfCreditFacilityInvestmentRestrictionRemainingBorrowingCapacityPercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
  17.50%tues_LineOfCreditFacilityInvestmentRestrictionRemainingBorrowingCapacityPercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Covenant terms     Our financial covenant requires that we maintain availability of 10% of our calculated borrowing base, but never less than $15 million  
Revolving credit facility outstanding amount 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
  0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Outstanding letters of credit 6,400,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
  6,400,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Availability under the credit facility 109,600,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
  109,600,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Interest expense 400,000us-gaap_InterestExpense
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
400,000us-gaap_InterestExpense
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
1,100,000us-gaap_InterestExpense
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
1,100,000us-gaap_InterestExpense
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Commitment fees 200,000us-gaap_LineOfCreditFacilityCommitmentFeeAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
200,000us-gaap_LineOfCreditFacilityCommitmentFeeAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
600,000us-gaap_LineOfCreditFacilityCommitmentFeeAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
600,000us-gaap_LineOfCreditFacilityCommitmentFeeAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Amortization of financing fees 200,000us-gaap_AmortizationOfFinancingCosts
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
200,000us-gaap_AmortizationOfFinancingCosts
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
500,000us-gaap_AmortizationOfFinancingCosts
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
500,000us-gaap_AmortizationOfFinancingCosts
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Revolving Credit Facility | Minimum        
DEBT        
Availability to be maintained under credit facility $ 15,000,000tues_LineOfCreditFacilityCovenantRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
  $ 15,000,000tues_LineOfCreditFacilityCovenantRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Revolving Credit Facility | Maximum        
DEBT        
Commitment fees (as a percent)     0.375%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember