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Note 9 - Capital Stock (Details Textual)				12 Months Ended
	Aug. 26, 2021 USD ($) $ / shares shares	Aug. 16, 2021	Jul. 27, 2021 $ / shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($)	Nov. 30, 2021 shares	Jul. 31, 2021 shares
Common Stock, Shares Authorized (in shares)				50,000,000	50,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares				$ 0.01	$ 0.01
Preferred Stock, Shares Authorized (in shares)				10,000,000	10,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares				$ 0.01	$ 0.01
Common Stock, Shares, Issued (in shares)				22,293,687	34,574,807
Common Stock, Shares, Outstanding, Ending Balance (in shares)				22,166,450	22,348,022
Preferred Stock, Shares Issued, Total (in shares)				0	0
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)								200,000
Treasury Stock, Value, Acquired, Cost Method | $				$ 7,000,000	$ 10,828,000	$ 2,281,000
Treasury Stock, Shares, Total (in shares)				127,237	12,226,785
Treasury Stock, Value, Total | $				$ 4,000,000	$ 169,946,000
The 2019 Tender Offer [Member]
Treasury Stock, Shares, Acquired (in shares)	272,405
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares	$ 37.00
Treasury Stock, Value, Acquired, Cost Method | $	$ 10,100,000
The 2019 Tender Offer [Member] | Minimum [Member]
Stock Repurchase Program Additional Shares Authroized To Be Repurchased Percent Of Outstanding Shares Percent			2.00%
Treasury Stock Acquired Cost Per Share (in dollars per share) | $ / shares			$ 32.00
The 2019 Tender Offer [Member] | Maximum [Member]
Treasury Stock Acquired Cost Per Share (in dollars per share) | $ / shares			$ 37.00
September 2011 Reauthorization [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)							500,000
Treasury Stock, Shares, Acquired (in shares)				168,847	18,732
Stock Split To [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio		2		2

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The percent of outstanding stock, authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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