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Note 8 - Debt (Details Textual) - USD ($) |  |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 13, 2020 | Nov. 16, 2016 | Sep. 30, 2016 | Sep. 02, 2016 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Repayments of Long-term Debt, Principal |  |  |  |  |  |  | $ 85,913,459 | $ (0) |
Gain (Loss) on Extinguishment of Debt, Total |  |  |  |  | $ 0 | $ 0 | (4,981,461) | $ 0 |
Warrants and Rights Outstanding |  |  |  |  | $ 7,752,534 |  | 7,752,534 |  | $ 6,116,882
Warrant Issued Alongside Entry Into the Loan Agreement [Member] |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding |  |  |  | $ 5,800,000 |  |  |  |  |
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 |  |  |  |  |  |  |
Proceeds from Issuance of Debt, Placed in Escrow |  |  | $ 80,000,000.0 |  |  |  |  |  |
Debt Instrument, Term (Year) |  |  |  | 4 years |  |  |  |  |
Debt Instrument, Repayment Fee |  |  |  | $ 4,000,000.0 |  |  |  |  |
Debt Issuance Costs, Gross |  |  |  | $ 8,200,000 |  |  |  |  |
Loan Agreement [Member] | Term Loan [Member] | OCM Strategic Credit SIGTEC Holdings, LLC [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 11.50% |  |  |  |  |
Loan Agreement [Member] | Term Loan [Member] | OCM Strategic Credit SIGTEC Holdings, LLC [Member] | US Treasury (UST) Interest Rate [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 0.50% |  |  |  |  |

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- Definition The amount of cash inflow during the period from additional borrowings in aggregate debt placed in escrow. Includes proceeds from short-term and long-term debt. + 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 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 Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 + Details
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