Note 10 - Long-term Incentive Plan - Information on Outstanding Grants Made to Directors Under the LTIP (Details) - Long-Term Incentive Plan [Member] - Director [Member] - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Common Stock [Member]
Granted, number of units (in shares)		21,875	14,286	10,220
Weighted Average Grant Date Fair Value (in dollars per share)	[1]	$ 1.20	$ 4.85	$ 6.85
Grant Date Total Fair Value		$ 26	$ 69	$ 70
Restricted Stock Units (RSUs) [Member]
Granted, number of units (in shares)		23,436	15,306	10,950
Weighted Average Grant Date Fair Value (in dollars per share)	[1]	$ 1.20	$ 4.85	$ 6.85
Grant Date Total Fair Value		$ 28	$ 74	$ 75

[1] Fair value is the closing market price on the grant date of the awards.