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Note 7 - Stockholders' Equity (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2016	Jul. 31, 2012
Excess Stock, Shares Authorized (in shares)	1,000,000
Preferred Stock, Shares Outstanding, Ending Balance (in shares)	0	0
Minimum [Member]
Equity Method Investment, Ownership Percentage			4.90%
Privately Negotiated Transaction [Member] \| Common Stock [Member]
Stock Repurchase Program, Authorized Amount				$ 5
Stock Repurchased During Period, Shares (in shares)	0	0
Restricted Stock [Member]
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)	0	0
Share-based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	0	42,000