Note 4 - Fair Value by Major Security Type (Details) (USD $)	Mar. 31, 2015
Long-term Securities	$ 2,799,988us-gaap_MarketableSecuritiesNoncurrent
Short-term Securities	1,746,087us-gaap_MarketableSecuritiesCurrent
Fair Value, Inputs, Level 1 [Member] \| Money Market Funds [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Cost Basis	31,618
Fair Value	31,618
Cash and Cash Equivalents	31,618
Fair Value, Inputs, Level 2 [Member] \| Certificates of Deposit [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Cost Basis	2,749,183
Fair Value	2,749,183
Long-term Securities	2,749,183
Fair Value, Inputs, Level 2 [Member] \| US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Cost Basis	2,070,868
Fair Value	2,072,397
Cash and Cash Equivalents	526,147
Long-term Securities	50,805
Unrealized Gains	1,529
Short-term Securities	1,495,445
Fair Value, Inputs, Level 2 [Member] \| Corporate Debt Securities [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Cost Basis	251,073
Fair Value	250,642
Unrealized Gains	(431)
Short-term Securities	250,642
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Cost Basis	5,071,124
Fair Value	5,072,222
Cash and Cash Equivalents	526,147
Long-term Securities	2,799,988
Unrealized Gains	1,098
Short-term Securities	1,746,087
Fair Value, Measurements, Nonrecurring [Member]
Cost Basis	5,102,742
Fair Value	5,103,840
Cash and Cash Equivalents	557,765
Long-term Securities	2,799,988
Unrealized Gains	1,098
Short-term Securities	$ 1,746,087

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

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- Definition

Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 2

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Total debt and equity financial instruments including: (1) securities held-to-maturity and (2) securities available-for-sale that will be held for the long-term.

+ References

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