Note 6 - Treasury Stock	6 Months Ended
Jun. 30, 2021
Notes to Financial Statements
Treasury Stock [Text Block]	6. Treasury Stock Common stock held in treasury totaled 963,509 and 948,347 with a cost of $2,234 and $2,182 at June 30, 2021 and December 31, 2020, respectively. These shares were withheld from employees to settle personal tax withholding obligations that arose as a result of restricted stock units that vested in the periods presented.

The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-URI http://asc.fasb.org/subtopic&trid=2208821

Name:	us-gaap_TreasuryStockTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration