Note 7 - Stockholders' Equity - Reconciliation of Activity in Stockholders' Equity Accounts (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Balance		$ 13,644			$ 13,644
Net income (loss)	$ (902)		$ 313		464	$ (3,054)
Settlement of employee benefit obligations directly related to the disposal transaction						2,422
Balance	14,151				14,151
Common Stock [Member]
Balance	294	294	295	$ 298	294	298
Net income (loss)
Stock-based compensation expense
Settlement of employee benefit obligations directly related to the disposal transaction
Stock repurchase			(1)	(3)
Dividends
Dividends
Balance	294	294	294	295	294	294
Additional Paid-in Capital [Member]
Balance	17,306	17,285	17,253	17,104	17,285	17,104
Net income (loss)
Stock-based compensation expense	22	21	14	391
Settlement of employee benefit obligations directly related to the disposal transaction
Stock repurchase			(29)	(100)
Dividends				(139)
Dividends
Balance	17,328	17,306	17,241	17,253	17,328	17,241
Retained Earnings [Member]
Balance	(2,569)	(3,935)	(5,862)	(2,495)	(3,935)	(2,495)
Net income (loss)	(902)	1,366	313	(3,367)
Stock-based compensation expense
Settlement of employee benefit obligations directly related to the disposal transaction
Stock repurchase
Dividends
Dividends
Balance	(3,471)	(2,569)	(5,549)	(5,862)	(3,471)	(5,549)
AOCI Attributable to Parent [Member]
Balance				(2,422)		(2,422)
Net income (loss)
Stock-based compensation expense
Settlement of employee benefit obligations directly related to the disposal transaction				2,422
Stock repurchase
Dividends
Dividends
Balance