Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
CURRENT ASSETS
Cash	$ 6,005	$ 869
Accounts receivable, net	1,336	1,362
Prepaid expenses and other assets	167	80
Assets held for sale	3,134	7,440
Total current assets	10,642	9,751
PROPERTY	51,414	51,956
Accumulated depreciation	(33,789)	(33,445)
Property, net	17,625	18,511
OTHER ASSETS
Deferred development costs	8,964	8,901
Other noncurrent assets	1,222	1,307
Total other assets	10,186	10,208
TOTAL ASSETS	38,453	38,470
CURRENT LIABILITIES
Accounts payable	441	899
Payroll and employee benefits	699	970
Long-term debt, current portion	0	200
Accrued retirement benefits, currernt portion	165	165
Deferred revenue, current portion	447	260
Other current liabilities	407	453
Total current liabilities	2,159	2,947
LONG-TERM LIABILITIES
Accrued retirement benefits	10,091	10,926
Other noncurrent liabilities	75	83
Total long-term liabilities	14,221	15,456
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY
Common stock--no par value, 43,000,000 shares authorized, 19,361,856 and 19,311,528 shares issued and outstanding	82,104	81,485
Additional paid-in-capital	9,184	9,184
Accumulated deficit	(47,959)	(48,904)
Accumulated other comprehensive loss	(21,256)	(21,698)
Total stockholders' equity	22,073	20,067
TOTAL LIABILITIES & STOCKHOLDERS' EQUITY	38,453	38,470
License [Member]
LONG-TERM LIABILITIES
Deferred revenue	1,700	1,767
Member Deposits [Member]
LONG-TERM LIABILITIES
Deferred revenue	$ 2,355	$ 2,680