000 - Document - Document And Entity Information link:calculationLink link:definitionLink link:presentationLink 001 - Statement - Condensed Consolidated Balance Sheets link:calculationLink link:definitionLink link:presentationLink 002 - Statement - Condensed Consolidated Balance Sheets (Parentheticals) link:calculationLink link:definitionLink link:presentationLink 003 - Statement - Condensed Consolidated Statements of Operations link:calculationLink link:definitionLink link:presentationLink 004 - Statement - Condensed Consolidated Statements of Cash Flows link:calculationLink link:definitionLink link:presentationLink 005 - Statement - Condensed Consolidated Statement of Shareholders' Equity (Unaudited) link:calculationLink link:definitionLink link:presentationLink 995552 - Disclosure - Note 1 - Description of Business link:calculationLink link:definitionLink link:presentationLink 995553 - Disclosure - Note 2 - Summary of Significant Accounting Policies link:calculationLink link:definitionLink link:presentationLink 995554 - Disclosure - Note 3 - Recent Accounting Pronouncements link:calculationLink link:definitionLink link:presentationLink 995555 - Disclosure - Note 4 - Cash, Cash Equivalents and Restricted Cash link:calculationLink link:definitionLink link:presentationLink 995556 - Disclosure - Note 5 - Revenues link:calculationLink link:definitionLink link:presentationLink 995557 - Disclosure - Note 6 - Property and Equipment link:calculationLink link:definitionLink link:presentationLink 995558 - Disclosure - Note 7 - Leases link:calculationLink link:definitionLink link:presentationLink 995559 - Disclosure - Note 8 - Basic Net Income Per Share link:calculationLink link:definitionLink link:presentationLink 995560 - Disclosure - Note 9 - Term Loans and Line of Credit Agreements link:calculationLink link:definitionLink link:presentationLink 995561 - Disclosure - Note 10 - Income Taxes link:calculationLink link:definitionLink link:presentationLink 995562 - Disclosure - Note 11 - Retirement Benefits link:calculationLink link:definitionLink link:presentationLink 995563 - Disclosure - Note 1 - Long-term Incentive Plan link:calculationLink link:definitionLink link:presentationLink 995564 - Disclosure - Note 13 - Shareholders' Equity link:calculationLink link:definitionLink link:presentationLink 995565 - Disclosure - Note 14 - Legal Matters link:calculationLink link:definitionLink link:presentationLink 995566 - Disclosure - Note 15 - Business Segment Information link:calculationLink link:definitionLink link:presentationLink 995567 - Disclosure - Note 16 - Certain Relationships and Related Transactions link:calculationLink link:definitionLink link:presentationLink 995568 - Disclosure - Note 17 - Injection Wells Suspension link:calculationLink link:definitionLink link:presentationLink 995569 - Disclosure - Significant Accounting Policies (Policies) link:calculationLink link:definitionLink link:presentationLink 995570 - Disclosure - Note 4 - Cash, Cash Equivalents and Restricted Cash (Tables) link:calculationLink link:definitionLink link:presentationLink 995571 - Disclosure - Note 5 - Revenues (Tables) link:calculationLink link:definitionLink link:presentationLink 995572 - Disclosure - Note 6 - Property and Equipment (Tables) link:calculationLink link:definitionLink link:presentationLink 995573 - Disclosure - Note 7 - Leases (Tables) link:calculationLink link:definitionLink link:presentationLink 995574 - Disclosure - Note 9 - Term Loans and Line of Credit Agreements (Tables) link:calculationLink link:definitionLink link:presentationLink 995575 - Disclosure - Note 10 - Income Taxes (Tables) link:calculationLink link:definitionLink link:presentationLink 995576 - Disclosure - Note 1 - Long-term Incentive Plan (Tables) link:calculationLink link:definitionLink link:presentationLink 995577 - Disclosure - Note 15 - Business Segment Information (Tables) link:calculationLink link:definitionLink link:presentationLink 995578 - Disclosure - Note 2 - Summary of Significant Accounting Policies (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995579 - Disclosure - Note 4 - Cash, Cash Equivalents and Restricted Cash - Cash, Cash Equivalents and Restricted Cash (Details) link:calculationLink link:definitionLink link:presentationLink 995580 - Disclosure - Note 5 - Revenues (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995581 - Disclosure - Note 5 - Revenues - Disaggregation of Revenue (Details) link:calculationLink link:definitionLink link:presentationLink 995582 - Disclosure - Note 5 - Revenues - Allowance for Doubtful Accounts (Details) link:calculationLink link:definitionLink link:presentationLink 995583 - Disclosure - Note 5 - Revenues - Contract Assets and Liabilities (Details) link:calculationLink link:definitionLink link:presentationLink 995584 - Disclosure - Note 6 - Property and Equipment (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995585 - Disclosure - Note 6 - Property and Equipment - Summary of Property and Equipment (Details) link:calculationLink link:definitionLink link:presentationLink 995586 - Disclosure - Note 7 - Leases (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995587 - Disclosure - Note 7 - Leases - Operating Leases Assets and Liabilities (Details) link:calculationLink link:definitionLink link:presentationLink 995588 - Disclosure - Note 7 - Leases - Lease Cost (Details) link:calculationLink link:definitionLink link:presentationLink 995589 - Disclosure - Note 7 - Leases - Future Commitments Under Long-term Leases (Details) link:calculationLink link:definitionLink link:presentationLink 995590 - Disclosure - Note 8 - Basic Net Income Per Share (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995591 - Disclosure - Note 9 - Term Loans and Line of Credit Agreements (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995592 - Disclosure - Note 9 - Term Loans and Line of Credit Agreements - Summary of Term Loan and Line of Credit Agreements (Details) link:calculationLink link:definitionLink link:presentationLink 995593 - Disclosure - Note 9 - Term Loans and Line of Credit Agreements - Future Maturities of Long-term Debt (Details) link:calculationLink link:definitionLink link:presentationLink 995594 - Disclosure - Note 10 - Income Taxes (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995595 - Disclosure - Note 10 - Income Taxes - Provision For Income Taxes (Details) link:calculationLink link:definitionLink link:presentationLink 995596 - Disclosure - Note 10 - Income Taxes - Schedule of Effective Income Taxes (Details) link:calculationLink link:definitionLink link:presentationLink 995597 - Disclosure - Noe 10 - Income Taxes - Schedule of Income Taxes Paid (Details) link:calculationLink link:definitionLink link:presentationLink 995598 - Disclosure - Note 10 - Income Taxes - Deferred Tax Assets and liabilities (Details) link:calculationLink link:definitionLink link:presentationLink 995599 - Disclosure - Note 11 - Retirement Benefits (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995600 - Disclosure - Note 1 - Long-term Incentive Plan (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995601 - Disclosure - Note 12 - Long-term Incentive Plan - Period and Predetermined Stock Price Needed for Vesting (Details) link:calculationLink link:definitionLink link:presentationLink 995602 - Disclosure - Note 13 - Shareholders' Equity (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995603 - Disclosure - Note 15 - Business Segment Information (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995604 - Disclosure - Note 15 - Business Segment Information - Segment Reporting Information (Details) link:calculationLink link:definitionLink link:presentationLink 995605 - Disclosure - Note 15 - Business Segment Information - Segment Reporting Asset Information (Details) link:calculationLink link:definitionLink link:presentationLink 995606 - Disclosure - Note 16 - Certain Relationships and Related Transactions (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995607 - Disclosure - Note 17 - Injection Wells Suspension (Details Textual) link:calculationLink link:definitionLink link:presentationLink