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Note 9 - Fair Value (Details Textual) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 01, 2020 | Oct. 26, 2020 | Dec. 31, 2018
Long-term Debt, Fair Value | $ 23,839,007 |  |  |  |
Long-term Debt, Total | 23,057,650 |  |  |  |
Payments to Acquire Affiliate's Warrants | $ 7,719,779 | $ (0) |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 9.95 | $ 9.95 |  |  | $ 9.95
Yellowstone Acquisition Company Warrants [Member] | Unrealized Gain (Loss) on Securities [Member] |  |  |  |  |
Unrealized Gain (Loss) on Derivatives | $ (2,933,516) |  |  |  |
BOC Yellowstone LLC [Member] | Yellowstone Acquisition Company Warrants [Member] |  |  |  |  |
Payments to Acquire Affiliate's Warrants | $ 7,719,779 |  |  |  |
Yellowstone Acquisition Company [Member] | Private Placement Warrants [Member] |  |  |  |  |
Price of Warrant (in dollars per share) | $ 1.00 |  | $ 1.00 | $ 1.00 |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | 1 |  |  | 1 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 11.50 |  | $ 11.50 | $ 11.50 |

X
- Definition The cash outflow associated with the purchase of affiliate's warrants. + References No definition available. + Details
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- Definition The per share price of warrant. + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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- Definition Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares. + References No definition available. + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: 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=121586364&loc=d3e3602-108585 + Details
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