Note 3 - Stock-based Compensation (Details Textual) - USD ($)	3 Months Ended	10 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 152,000		$ 152,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 14 days
Restricted Stock [Member]
Share-based Payment Arrangement, Expense	$ 27,000	$ 0
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Expense	$ 74,000	$ 91,000
Incentive Plan 2020 [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	0	0	8,912
The2004 Plan Member
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)	0	0
Incentive Plan 2020 [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	1,800,000		1,800,000

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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