Note 6 - Employee Retirement Benefit Plans (Details) - USD ($)		12 Months Ended		20 Months Ended
	Apr. 23, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2015	Apr. 21, 2015
Pension Plan Settlement Agreement, Amount Payable					$ 10,500,000
Pension Plan Settlement Agreement, Payment Schedule		with $1,500 due within ten days following the effective date of the Pension Settlement Agreement and the remainder paid in twelve annual installments of $750 beginning on October 31, 2015
Pension Plan Settlement Agreement, Stock Payable					88,117
Settled ERISA Liabilities					$ 46,000,000
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,100,000
Unfunded Pension Plan Liability	$ 35,870,000				$ 35,870,000
Other Comprehensive Income			$ 31,776,000
Stock Issued During Period, Value, Other	$ 70,000
Pension Settlement Obligation, Interest Rate					7.00%
Pension Expenses for the period		262,000	522,000
SERP minimum liability		258	(750)	$ (750)
SERP minimum liability		(258)	750	$ 750
SERP discount rate		$ 0.0370	$ 0.0380
Assumptions Used Calculating Benefit Obligation, Discount Rate		3.70%	3.80%	3.80%
Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate		3.70%	3.80%
Insurance Premium Due To The PBGC
Insurance premium due PBGC			$ 99,000
401(k) Deferred Savings Plan
Contributions		$ 182,000		$ 168,000
Treasury Stock
Stock Issued During Period, Shares, Treasury Stock Reissued	88,117
Intercreditor Agreement
Line of Credit Facility, Maximum Borrowing Capacity		6,500,000
Second Intercreditor Agreement
Line of Credit Facility, Maximum Borrowing Capacity		$ 3,000,000