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Note 7 - Long-term Debt (Details Textual) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Letters of Credit Outstanding, Amount | $ 310,000 | $ 310,000
Texas Real Estate Agreement [Member] |  |
Debt Instrument, Number of Installment Payments | 120 |
Debt Instrument, Interest Rate, Stated Percentage | 3.02% |
Line of Credit [Member] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 60,000,000.0 |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.25% |
Average Daily Borrowings Amount Unused Fee Trigger | $ 18,000,000.0 |
Ratio of Indebtedness to Net Capital | 4 |
Line of Credit Facility, Outstanding Advances | $ 400,000 | 18,600,000
Letters of Credit Outstanding, Amount | 300,000 | $ 300,000
Line of Credit Facility, Remaining Borrowing Capacity | $ 59,600,000 |
Line of Credit [Member] | Equipment Financing [Member] |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 2.81% |
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Debt Instrument, Basis Spread on Variable Rate | 1.25% |
Line of Credit Facility, Interest Rate at Period End | 1.75% |
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |
Debt Instrument, Basis Spread on Variable Rate | 0.50% |

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