Note 8 - Other Borrowings - Composition of Other Borrowings (Details) (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Secured Notes With Interest At 1.72% [Member]
Debt instrument, interest rate, stated percentage	1.72%	1.72%
Debt instrument, maturity date	Sep. 01, 2020	Sep. 01, 2020
Secured Notes With Interest At 2.90% [Member]
Debt instrument, interest rate, stated percentage	2.90%	2.90%
Debt instrument, maturity date	Jun. 01, 2021	Jun. 01, 2021
Secured Note With Variable Interest [Member]
Debt instrument, interest rate, stated percentage	2.13%	2.99%
Debt instrument, maturity date	Sep. 01, 2021	Sep. 01, 2021
Secured Notes With Interest At 1.86% [Member]
Debt instrument, interest rate, stated percentage	1.86%	1.86%
Debt instrument, maturity date	Sep. 01, 2021	Sep. 01, 2021
Secured Notes With Interest At 2.94% [Member]
Debt instrument, interest rate, stated percentage	2.94%	2.94%
Debt instrument, maturity date	Dec. 01, 2021	Dec. 01, 2021
Secured Notes With Interest At 2.98% [Member]
Debt instrument, interest rate, stated percentage	2.98%	2.98%
Debt instrument, maturity date	Jun. 01, 2022	Jun. 01, 2022
Secured Notes With Interest At 1.97% [Member]
Debt instrument, interest rate, stated percentage	1.97%	1.97%
Debt instrument, maturity date	Sep. 01, 2022	Sep. 01, 2022
Note Payable With Interest At 4.875% [Member]
Debt instrument, interest rate, stated percentage	4.875%	4.875%
Debt instrument, maturity date	Sep. 01, 2022	Sep. 01, 2022
Debt instrument, periodic principal payments	$ 250	$ 250

Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: 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(a)(1))
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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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Amount of the required periodic payments applied to principal.

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