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Note 8 - Stockholders' Equity (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2016	Jul. 31, 2012
Excess Stock, Shares Authorized	1,000,000
Preferred Stock, Shares Outstanding, Ending Balance	0
Stock Repurchased During Period, Value		$ 133,000
Minimum [Member]
Equity Method Investment, Ownership Percentage			4.90%
Common Stock [Member]
Stock Repurchased During Period, Shares		268,000
Stock Repurchased During Period, Value		$ 4,000
Privately Negotiated Transaction [Member] \| Common Stock [Member]
Stock Repurchased During Period, Shares	0	221,121
Stock Repurchased During Period, Value		$ 133,000
Stock Repurchase Program, Authorized Amount				$ 5,000,000
Share-based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	42,000	225,000
Restricted Stock [Member]
Stock Repurchased During Period, Shares	0	46,643
Stock Repurchased During Period, Value		$ 30,000