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Note 7 - Debt (Details Textual) - USD ($) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 13, 2020 | Nov. 16, 2016 | Sep. 02, 2016 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Repayments of Long-term Debt, Principal |  |  |  | $ (0) | $ 85,913,459 | $ (0)
Gain (Loss) on Extinguishment of Debt, Total |  |  |  | $ 0 | (4,981,461) | $ 0
Loan Agreement [Member] | Term Loan [Member] | OCM Strategic Credit SIGTEC Holdings, LLC [Member] |  |  |  |  |  |
Repayments of Long-term Debt Including Interest | $ 87,200,000 |  |  |  |  |
Repayments of Long-term Debt, Principal | 80,000,000.0 |  |  |  |  |
Repayments of Long-term Debt, Repayment Fee | 4,000,000.0 |  |  |  |  |
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total | 1,200,000 |  |  |  |  |
Repayments of Long-term Debt, Prepayment Premium | $ 1,900,000 |  |  |  |  |
Gain (Loss) on Extinguishment of Debt, Total |  |  |  |  | $ (5,000,000.0) |
Proceeds from Issuance of Debt |  | $ 80,000,000.0 |  |  |  |
Debt Instrument, Term (Year) |  |  | 4 years |  |  |

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- Definition The cash outflow for the fee that accompanies the repayment of the debt instrument. + References No definition available. + Details
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- Definition The cash outflow for debt including interest initially having maturity due after one year or beyond the normal operating cycle, if longer. + References No definition available. + Details
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- Definition The cash outflow during the period for the prepayment premium of the debt instrument. + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123467658&loc=d3e12355-112629 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467658&loc=d3e12317-112629 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
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