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Note 9 - Fair Value - Fair Values for Investments (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Trading securities |  | $ 83,100,805
Trading securities, realized gain (loss) | 6,406 |
Trading securities, unrealized gain (loss) | (132,191) |
Securities available for sale, realized gain (loss) | 739,589 |
Securities available for sale, unrealized gain (loss) | 116,796 |
Realized gain (loss) | 745,995 |
Unrealized gain (loss) | (15,395) | $ 132,191
Reported Value Measurement [Member] |  |
Trading securities |  |
Securities available for sale | 86,845,386 |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Trading securities |  |
Securities available for sale | $ 86,845,386 |

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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