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Note 11 - Federal and State Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	$ 1,214,000	$ 1,378,000
Deferred Tax Assets, Tax Credit Carryforwards, General Business	988,000
Operating Loss Carryforwards	19,876,000
Income Tax Examination, Penalties and Interest Expense	$ 0	0
Statute of Limitations	3 years
Receivables, Long-term Contracts or Programs	$ 167,000	$ 484,000

X

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Alternative Minimum Tax
-URI http://asc.fasb.org/extlink&oid=6504908

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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Amount to be collected within one year of the balance sheet date (or one operating cycle, if longer) from customers in accordance with the contractual provisions of long-term contracts or programs including amounts billed and unbilled as of the balance sheet date.

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