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Note 10 - Income Taxes (Details Textual) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
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Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Bad Debt Reserve for Tax Purposes of Qualified Lender | $ 14,900,000 | $ 14,900,000
Deferred Tax Assets, Net, Total | 2,762,000 | 2,741,000
Operating Loss Carryforwards, Total |  | 160,236
Tax Credit Carryforwards, Alternative Minimum Tax, Not Subject to Expiration | 225,000 |
State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards, Total | 44,500,000 |
State and Local Jurisdiction [Member] | Illinois Department of Revenue [Member] |  |
Tax Credit Carryforward, Valuation Allowance | 0 | $ 200,000
Domestic Tax Authority [Member] |  |
Operating Loss Carryforwards, Total | $ 7,000,000.0 |

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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- Definition Amount of deferred tax liability not recognized because of the exceptions to comprehensive recognition of deferred taxes related to bad debt reserve for tax purposes of a qualified lender. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 740 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479915&loc=d3e66715-112838 + Details
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