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Note 20 - Revision of Previously Issued Consolidated Financial Statements (Details Textual) - USD ($)	Apr. 30, 2021	Dec. 31, 2020	Apr. 30, 2020	Dec. 31, 2019	Apr. 30, 2019	May 01, 2018	Apr. 30, 2018
Equity Securities, FV-NI, Total	$ 23,582,000		$ 14,125,000			$ 9,379,000
Equity Securities, FV-NI, Accumulated Gross Unrealized Gains						994,000
Deferred Tax Liabilities, Investments						209,000
Stockholders' Equity Attributable to Parent, Ending Balance	67,013,000	$ 53,539,000	53,539,000	$ 47,524,000	$ 47,524,000		$ 43,541,000
AOCI Attributable to Parent [Member]
Stockholders' Equity Attributable to Parent, Ending Balance	3,000		131,000		34,000		783,000
Retained Earnings [Member]
Stockholders' Equity Attributable to Parent, Ending Balance	$ 72,502,000		$ 57,374,000		$ 50,242,000		44,902,000
Cumulative Effect, Period of Adoption, Adjustment [Member]
Stockholders' Equity Attributable to Parent, Ending Balance
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-01 [Member]
Stockholders' Equity Attributable to Parent, Ending Balance						0
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-01 [Member] | AOCI Attributable to Parent [Member]
Stockholders' Equity Attributable to Parent, Ending Balance						(785,000)	(785,000)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-01 [Member] | Retained Earnings [Member]
Stockholders' Equity Attributable to Parent, Ending Balance						$ 785,000	$ 785,000

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