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Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual)	3 Months Ended					6 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Apr. 01, 2020 USD ($)	Aug. 12, 2019
Number of Operating Segments						4
Retained Earnings (Accumulated Deficit), Ending Balance		$ 72,359,000				$ 74,724,000	$ 72,359,000
Cumulative Effect, Period of Adoption, Adjustment [Member] \| Accounting Standards Update 2016-13 [Member]
Retained Earnings (Accumulated Deficit), Ending Balance								$ (9,000)
The Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage				1.375%		1.375%
The Notes [Member] \| Senior Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage		1.375%				1.375%	1.375%		1.375%
Revision of Prior Period, Adjustment [Member]
Retained Earnings (Accumulated Deficit), Ending Balance	$ 192,000
Overstatement of Cost of Revenues [Member]
Quantifying Misstatement in Current Year Financial Statements, Amount	372,000						$ 429,000
Overstatement of Accumulated Other Comprehensive Income [Member]
Quantifying Misstatement in Current Year Financial Statements, Amount							429,000
Amount By Which Operating Income Would Increase if Cost of Revenues Had Not Been Overstated [Member]
Quantifying Misstatement in Current Year Financial Statements, Amount							429,000
Amount By Which Net Income Would Increase if Cost of Revenues Had Not Been Overstated [Member]
Quantifying Misstatement in Current Year Financial Statements, Amount							429,000
Amount By Which Diluted Earnings Per Share Would Increase if Cost of Revenues Had Not Been Overstated [Member]
Quantifying Misstatement in Current Year Financial Statements, Amount	0.04						$ 0.10
Overstatement of Cost of Goods Sold [Member]
Quantifying Misstatement in Current Year Financial Statements, Amount		$ 128,000	$ 126,000	$ 110,000	$ 65,000
Understatement of Net Income [Member]
Quantifying Misstatement in Current Year Financial Statements, Amount		$ 128,000	$ 126,000	$ 110,000	$ 65,000
Amount By Which After-tax Income Would Increase if Cost of Revenues Had Not Been Overstated [Member]
Quantifying Misstatement in Current Year Financial Statements, Amount	$ 192,000